Develop Bugs

Battery charging after update

Anyone else got this? My battery should be fully charged in the morning with the green light on - but the battery is 91% (or 94% or 99%). Then if I plug the charger it jumps from 91% to 100% in seconds.
Just hope its just waiting few cycles to calibrate or something... :/

Yeah, it seems to sort itself out after a few charges.

same with mine, only just happened after the update

I have something else to share about battery charging after update. I usually charge my phone from my computer's usb port during the night.
However after the update USB charging is much slower than before. It would take about 4 hours to charge from empty, but since the updates it only charges with a rate of 13% every hour so it takes more than 7 hours to fully charge from empty.
Anybody else noticed this?

zonkkk said:
I have something else to share about battery charging after update. I usually charge my phone from my computer's usb port during the night.
However after the update USB charging is much slower than before. It would take about 4 hours to charge from empty, but since the updates it only charges with a rate of 13% every hour so it takes more than 7 hours to fully charge from empty.
Anybody else noticed this?
Click to expand...
Click to collapse
yeah, ive had these same exact issues. its so annoying. its just not worth charging via PC usb any more

The GTalk issue is out there again, not sure if its the culprit? I have unchecked the 'automatically sign in' and logged out, but it keeps turning on and logging me in by itself. Im sure its one of the reasons for the battery drain. Anyone else with this?
This morning it dropped from 100% to 88% in less than two hours without really doing anything with the phone...

this whole 'stopping charging till 90% once its reached 100%' issue is rediculous. I cant believe that HTC have added this to the update (cos it didnt happen before) for a phone where users rarely get a days usage out of the phone battery anyway! Now you even stand the chance of starting the day with 10% less charge than you should....rediculous!
if its something they want to include then thats fine, but at least give us the option of turning it off

This is from a german forum:
Let the phone empty the battery until it switch off for its own. Switch on again and do a new boot until the phone is switch off again. When switched off charge the battery completely with the original charger.
... and the 90% issue is gone

I have a second battery I never used before. Im going to put it to charge tonight - and let it do few complete full/drained cycles. Hope works ok.
Wonder if everyone else has the persistent GTalk on? I dont want it!! Arghhhhh....

I have the same issue with mine Desire after updating last week,just get the green light for a full charge and after a few minutes I check my battery widget and lol 10 % are gone.Any chances for fixing that issue?I would appreciate if anyone give a helpful advice.thanx in advance.cheers

zahari said:
I have the same issue with mine Desire after updating last week,just get the green light for a full charge and after a few minutes I check my battery widget and lol 10 % are gone.Any chances for fixing that issue?I would appreciate if anyone give a helpful advice.thanx in advance.cheers
Click to expand...
Click to collapse
look up at post #8 and give that a try. Thats what im gonna do and im sure people will report back on here after theyve tried it to see if it works

topcaser said:
This is from a german forum:
Let the phone empty the battery until it switch off for its own. Switch on again and do a new boot until the phone is switch off again. When switched off charge the battery completely with the original charger.
... and the 90% issue is gone
Click to expand...
Click to collapse
this didnt work with me...still have the 90% issue

Look to this thread, we are talking about the same issue.
http://forum.xda-developers.com/showthread.php?t=689861

gyro11 said:
this didnt work with me...still have the 90% issue
Click to expand...
Click to collapse
The same here...

do we have new info about this issue ?

Is this such a huge issue then? I mean, sure you want it to show the correct %. But does it affect the total duration in any way?
The 10% can eventually level out when being used. I wonder if the device is at e.g. 30% it should actually be 40% in this case, or the 30% is actually quite accurate.
The % is an estimate to give a better representation how much there is left rather than just following the voltage drop. But in the end it will most probably be the voltage that makes the device decide whether or not the battery is empty.

Don't be silly, ofcourse this is a huge issue, did u ever seen such a issue on any other device, even devices of 5$ dont have this strange behavior.
Phone from such class to have such a problem, this is annoying.
And rather iPhone4 signal strenth issue i think here problem is software and it will be fixed

Comon, a 'huge issue'?! It's merely some % figure that's not shown correctly.
Oh well, I guess it's a compliment for the Desire then.. if 10% off is a huge issue, the rest can't be so bad!
Devices of $5 are really bad in showing correct percentages really. One part of the % goes fast, other slow and then suddenly fast again (you know, 1 out of 3 blocks left but flat battery in no-time, while the second block lasted hours and hours). Just because a device says it's 100% loaded, it doesn't mean it's actually correct.
That's why I wondered: Does it actually affect battery performance. If it does, then (and only then) you can call it a 'huge issue'. Otherwise I would just call it a minor annoyance. But obviously stuff like this might be personal eh!
But I'm quite convinced as well this is a software problem and can be fixed. I just don't think it will be very high on the HTC priority list

Ok, i agree its minor annoyance, but anyway it's annoying at least to me, you are right, this percentage may be fake, but for me it will be better if they show me real battery load
cheers
ps. i saw in your signature u r 1.15.405.4 - do u have this behavior on it ?

Well, the Desire is gone to be replaced now. But I didn't have this problem with my old Desire. Then that one got replaced (because HTC scratched it), and the new one did have this problem.
But now the Desire is off again because of weird touchscreen problem, so lets see how the new one holds up

Battery calibration app

Could someone please develop a good app that would enable the battery to be drained as much as possible and to charge slower so we could all properly calibrate our batteries?

Do we really need this since it's a Li-ion battery? I know Ni-Mh and Ni-Cad has memory effect, but not on the Li-Ion battery.

I was just wondering the same thing today....simply because there seems to be several different methods to do it. Some say charge 8 hours, turn off, charge and hour, unplug, turn on charge 10 minutes. Then other methods say to do something different....be nice to have an app to walk you through different methods so you know step by step your doing it right

I calibrated mine last night and I'm going to get about 18 hours if not more from it....before yesterday I was getting 9.
The ONLY other different I did was make some profiles on CPU but I cant imagine it would make that much of a difference. I bet its a mix of both

deonjahy said:
Could someone please develop a good app that would enable the battery to be drained as much as possible and to charge slower so we could all properly calibrate our batteries?
Click to expand...
Click to collapse
That is to funny I was just saying to my wife the other day that I should make one of these programs seeing that there are none already. I hate having to manually kill my battery every night before I charge it again.
Is it needed? It depends on your school of thought, some say yes, some say no. All I know is that on the few devices I have had in the past, if I constantly plug them in to "top them off" then the battery never ends up lasting very long after a few months of doing that. So I am a believer in killing the battery before charging on devices like these.
So the bottom line is if there is a desire for this, I may try to put an app together for it, as I know myself I am interested I just didn't think many others would be.

All the battery calibration tools, are basically deleting the file... right?
Is it that hard to boot into recovery and wipe battery stats?

deonjahy said:
Could someone please develop a good app that would enable the battery to be drained as much as possible and to charge slower so we could all properly calibrate our batteries?
Click to expand...
Click to collapse
I think the second part has to do with hardware. The phones hardware just doesn't have trickle charge implemented and instead lets it drop back down to 90% then starts charging it again.
As for the second part, it came on our phones, even has a default widget. 4G
paulieb81 said:
That is to funny I was just saying to my wife the other day that I should make one of these programs seeing that there are none already. I hate having to manually kill my battery every night before I charge it again.
Is it needed? It depends on your school of thought, some say yes, some say no. All I know is that on the few devices I have had in the past, if I constantly plug them in to "top them off" then the battery never ends up lasting very long after a few months of doing that. So I am a believer in killing the battery before charging on devices like these.
So the bottom line is if there is a desire for this, I may try to put an app together for it, as I know myself I am interested I just didn't think many others would be.
Click to expand...
Click to collapse
Um... actually that is (by most accounts) bad for Li-Ion. You want to AVOID completely draining them. All of this stuff is more art than science, but I have way more often heard that completely draining LI batteries is bad. What kills them is the number of cycles they have been through (like -25 +25, -25 +25, -50 +50 would be a full cycle).
You do however want to give them a full up down cycle once in a while (maybe every 1-3 months) for calibration.
Then again, as I said, it is more art than science, and I have heard your method as being better, but the not draining argument seems to be the vast majority.
I'll try to do a little look-see and update this or repost if I find any stronger evidence.

the thing about my phone and battery that ALWAYS baffled me was i would plug it in at night be it at 10% or 22 i would leave plugged in while slept i would wake up unplug and look at battery percentage and it would be like 95.....no other phone has even unplugged and dropped 5 percent by doing nothing????

turn your brightness to 100% and change it so that it never turns off; use wifi tether and play a 720p movie at the same time; oc your kernel to it's highest stable frequency. it'll drain pretty quickly.

I know I might get flamed for this....
Apple suggests, with their laptops, to once a month or so, run the battery completely down. Then let the battery cool down for a little bit. Then give it a full, uninterrupted, overnight charge. I forget if they said to repeat this a second time, then you're good.
This is all from memory of me reading this a couple years ago or so, so our might not be verbatim. Their laptops use lithium ion technology...
(and they used to blow up and melt down too!) Lol!
Wrong word choice and misspelling courtesy of swype.

mykeldrip said:
the thing about my phone and battery that ALWAYS baffled me was i would plug it in at night be it at 10% or 22 i would leave plugged in while slept i would wake up unplug and look at battery percentage and it would be like 95.....no other phone has even unplugged and dropped 5 percent by doing nothing????
Click to expand...
Click to collapse
That's because the phone stops charging when it reaches 100%, and runs off of battery probably until it reaches in the low 90s, then charges again. You won't ever notice this because the light will always be green. However, you'll notice that unplugging it a few moments after it turns green, the battery will stay anywhere from 100%-98% for a while. At least on my phone it does.

Is there any way to make this program "auto run" during sleep so it can do everything it needs to do during the night charge (similar to quickpull for blackberry)

laydros said:
I think the second part has to do with hardware. The phones hardware just doesn't have trickle charge implemented and instead lets it drop back down to 90% then starts charging it again.
As for the second part, it came on our phones, even has a default widget. 4G
Um... actually that is (by most accounts) bad for Li-Ion. You want to AVOID completely draining them. All of this stuff is more art than science, but I have way more often heard that completely draining LI batteries is bad. What kills them is the number of cycles they have been through (like -25 +25, -25 +25, -50 +50 would be a full cycle).
You do however want to give them a full up down cycle once in a while (maybe every 1-3 months) for calibration.
Then again, as I said, it is more art than science, and I have heard your method as being better, but the not draining argument seems to be the vast majority.
I'll try to do a little look-see and update this or repost if I find any stronger evidence.
Click to expand...
Click to collapse
I am by no means an expert so if you find any reliable info on this and can link us to read, I would love to learn more. All I know is that it is commonly said to drain rechargeable batteries and that I have seen that topping them off very often does lead to battery life degradation.

Tyzing said:
Is there any way to make this program "auto run" during sleep so it can do everything it needs to do during the night charge (similar to quickpull for blackberry)
Click to expand...
Click to collapse
There is no need to fully drain the battery. Its purpose in calibration is to configure the software that is correlating voltage to percentage charged. That's all. Regarding the old Apple advice, that is doing the same thing. It will not affect the hardware.
Now, what WILL affect the hardware is charging itself. Every charge/discharge cycle will reduce the total capacity of the battery. This is why the EVO will not cycle on it's own until 10% discharged. It's improving the overall battery life by that restriction.
In short, you will save money overall by getting a higher capacity battery that you don't force to charge too often. Draining your battery does nothing but give you peace of mind and it only really needs recalibrating when it's total capacity has been reduced which isn't often. 3-6 months.
Sent from my PC36100 using XDA App

herbthehammer said:
I know I might get flamed for this....
Apple suggests, with their laptops, to once a month or so, run the battery completely down. Then let the battery cool down for a little bit. Then give it a full, uninterrupted, overnight charge. I forget if they said to repeat this a second time, then you're good.
This is all from memory of me reading this a couple years ago or so, so our might not be verbatim. Their laptops use lithium ion technology...
(and they used to blow up and melt down too!) Lol!
Wrong word choice and misspelling courtesy of swype.
Click to expand...
Click to collapse
Yeah except that's not a good idea, it will kill the weak cells.

I understand. Still think it would be useful if it would do the "juice until LED changes" method while sleeping though

paulieb81 said:
So the bottom line is if there is a desire for this, I may try to put an app together for it, as I know myself I am interested I just didn't think many others would be.
Click to expand...
Click to collapse
I'm interested!

Btw - what are the charging calibrations people are using? Are you seeing one working better than another?

Im a noob, so take what I say worth a grain of salt but yesterday I did the standard method where you fully charge...turn off...plug back in until led changes green and do it a few times.
I went from 9 hours to 17 hours with no other changes except a few profiles in setCPU.
I did this just last night so my results are fresh.

Tyzing said:
I calibrated mine last night and I'm going to get about 18 hours if not more from it....before yesterday I was getting 9.
The ONLY other different I did was make some profiles on CPU but I cant imagine it would make that much of a difference. I bet its a mix of both
Click to expand...
Click to collapse
A few SetCPU profiles is all it takes to see a dramatic increase in battery life, especially while screen off. If you disable it I bet whatever gain you think was from 'calibrating' it disappears.

Is charging the battery constantly bad?

Hey everyone.
Just wanted to know if charging the tablet almost constantly is a bad thing. I use the tablet a lot every day, so when I'm at 60%, for example, I charge it again while I'm at lunch or doing something else, so that I can keep using the tablet later with full charge available again. I never let my tablet go down to 5%.
Is this bad for the battery in the long run?
Thanks.

Generally, it's best to not allow full cycle recharging...i.e. not fully charge or discharge, it's better for small charge cycles, like 40%<->90%
Some links to help garner some understanding:
http://forum.xda-developers.com/showthread.php?t=2469261
Which provides these links:
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
http://www.eetasia.com/STATIC/PDF/200806/EEOL_2008JUN16_POW_TA_01.pdf
http://macomp.ru/wp-content/uploads/2012/04/1607542.pdf

mdamaged said:
Generally, it's best to not allow full cycle recharging...i.e. not fully charge or discharge, it's better for small charge cycles, like 40%<->90%
Some links to help garner some understanding:
http://forum.xda-developers.com/showthread.php?t=2469261
Which provides these links:
http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
http://www.eetasia.com/STATIC/PDF/200806/EEOL_2008JUN16_POW_TA_01.pdf
http://macomp.ru/wp-content/uploads/2012/04/1607542.pdf
Click to expand...
Click to collapse
That's right. At least for what I know. It says the same on Apple's website about batteries. :good:

So then I guess I'm doing it right, correct?
I charge from 60% to 100% or from 50% to 100% again. Maybe I should do it only up to 90% then.

Sensamic said:
So then I guess I'm doing it right, correct?
I charge from 60% to 100% or from 50% to 100% again. Maybe I should do it only up to 90% then.
Click to expand...
Click to collapse
I only charge to 100% when I am going to be away from a charger for a long time, otherwise I stop at 90%-ish (my battery app announces when it is at 90% and there are kernels which will stop the charge at what you specify), as the links above state, charging to 100% all the time will shorten the lifetime of your battery, this may or may not matter to someone, for example, if you buy a new tablet every year, or you're well-off financially, then you're probably not too concerned with how many years your battery lasts, in which case charging to 100% a lot won't really matter much, since you'll likely own a newer tablet by time the battery does die.
In short, it's up to you and what you want to get out of your battery's lifetime.

I am using the good old 100% and then use until near 0%. I have found that this way the battery lasts longer.
As I am writing i have 43% battery with 5:40h screen time. I am using Greenify btw.

mulperi said:
I am using the good old 100% and then use until near 0%. I have found that this way the battery lasts longer.
As I am writing i have 43% battery with 5:40h screen time. I am using Greenify btw.
Click to expand...
Click to collapse
There are two kinds of battery life. These recommendations are for battery longevity. How long until the battery begins to lose the ability to fully charge.
The article at battery university explains how charging works, and the best way to charge batteries. What you are doing is the opposite of that way. If you think you are going to have your tablet longer than a year, it's worth taking the time to read the articles linked.
There is noting particularly wrong with full charges every time, but there are 'righter' ways to charge.
Sent from my Nexus 7 using XDA Premium 4 mobile app

Is there any kind of battery forming on new nexus7?
I mean i bought nexus 7 and straight from box i rooted,unlocked and installed custom kernel which forbids battery 2 fully charge over 92%...
Should i revert to stock and firstly fully charge my tablet then go to custom kernel or i am good at it right now ? Tnx
ps. (my nexus 7 was on 38% when i put it out of box)

aigaming said:
Is there any kind of battery forming on new nexus7?
I mean i bought nexus 7 and straight from box i rooted,unlocked and installed custom kernel which forbids battery 2 fully charge over 92%...
Should i revery to stock and firstly fully charge my tablet then go to custom kernel or i am good at it right now ? Tnx
ps. (my nexus 7 was on 38% when i put it out of box)
Click to expand...
Click to collapse
Based on what I've read, you'd gain no benefit by reverting to stock and charging to 100%, it MAY or may not effect the internal battery calibration, but it does not affect the lifetime or anything.
Also, these kernels usually have a way for you to change the % at which it stops, usually by cat'ing or changing some value that the kernel reads, you could just cat/echo/change 92% to 100%, and let it charge to 100%, then change it back. YMMV.

mdamaged said:
Based on what I've read, you'd gain no benefit by reverting to stock and charging to 100%, it MAY or may not effect the internal battery calibration, but it does not affect the lifetime or anything.
Also, these kernels usually have a way for you to change the % at which it stops, usually by cat'ing or changing some value that the kernel reads, you could just cat/echo/change 92% to 100%, and let it charge to 100%, then change it back. YMMV.
Click to expand...
Click to collapse
Tnx m8

The worst thing you can do to lithium-ion batteries is let them discharge completely.
Not letting the lithium-ion batteries discharge more than 10% will increase the cycles by thousands we're talking going from 350 cycles to 4000.
So, ideally, you want to charge your batteries (of this type) after a 10% discharge but we all know that's impossible so the best thing you can do is to charge your tablet everytime you can. Even if it has much battery left.

I knew that allready but i didn't know that it is not good to charge battery to 100 till i came to nexus 7 forums I always charged all my devices to 100% and never had a problem with battery
Sent from my LG-P990 using Tapatalk

aigaming said:
I knew that allready but i didn't know that it is not good to charge battery to 100 till i came to nexus 7 forums I always charged all my devices to 100% and never had a problem with battery
Sent from my LG-P990 using Tapatalk
Click to expand...
Click to collapse
You should charge to 100%, there is no problem with that.
On a perfect world you would want to charge everytime the battery hit 90%, this gives the best amount of charge cycles and life time.
However we all know that's not going to happen because the tablet is here to serve our needs and not the other way around so stick to charging it whenever you can.

Great Question!
First let me start off by saying to the person that started this thread that this was a really good question to ask!
Now if you are trying to get the most out of your battery then you could look into installing/flashing a custom kernel that could allow for undervolting which could in theory give your battery more life.
So you all are saying that the best thing to do is to charge up to 90% and never let it get down to less than 10%? Always start charging when the battery gets to like 40%?
One question i have for the Nexus 7 2013. Is it even possible to remove the battery for this tablet or does it void the warranty? Second has anyone purchased a spare battery (if possible) for their Nexus 7 2013? If you did could you post a link to where you got it and let us know how much you paid?...
Great question and thread!
-droidshadow

droidshadow said:
First let me start off by saying to the person that started this thread that this was a really good question to ask!
Now if you are trying to get the most out of your battery then you could look into installing/flashing a custom kernel that could allow for undervolting which could in theory give your battery more life.
So you all are saying that the best thing to do is to charge up to 90% and never let it get down to less than 10%? Always start charging when the battery gets to like 40%?
Click to expand...
Click to collapse
There has been speculation in the franco thread that undervolting could actually hurt battery charge life, due to the CPU having to work harder due to having less voltage, not sure if that has any merit or not.
The reasoning behind the not charging above 90%, and not allowing full-cycle charges is outlined much better in the links I posted than I could do here, also I would be just regurgitating information that is already there for the most part.
40% is just a number I pulled out of air, the best practice is to keep the charge delta as small as possible. So, let's say we charge the device to 90%, it is better to charge it when it hits 80% than it is to wait till it hits 70%, because a smaller charge delta has occurred, so charge often, but if you want the lifetime of your battery to be maximized (lifetime as in the way ezas explained it, i.e. "(...)battery longevity. How long until the battery begins to lose the ability to fully charge"), than try to not charge it to 100%.
Also, it has to be said, heat also affects the battery longevity, that is why I also recommend not charging while a device is in its case. And not leaving it sit on a Qi charger for too long, some cause more heat than others, but heat is a battery's enemy.
droidshadow said:
One question i have for the Nexus 7 2013. Is it even possible to remove the battery for this tablet or does it void the warranty? Second has anyone purchased a spare battery (if possible) for their Nexus 7 2013? If you did could you post a link to where you got it and let us know how much you paid?...
Great question and thread!
-droidshadow
Click to expand...
Click to collapse
It would no doubt void your warranty. As for battery replacements, I have not yet found one, I'm not saying there isn't one to be found, but I have yet to find it, I figure the reason is because they are not yet in demand since the tablet is relatively new and demands for replacement batteries would be too low, obviously and eventually this will change.

droidshadow said:
First let me start off by saying to the person that started this thread that this was a really good question to ask!
Now if you are trying to get the most out of your battery then you could look into installing/flashing a custom kernel that could allow for undervolting which could in theory give your battery more life.
So you all are saying that the best thing to do is to charge up to 90% and never let it get down to less than 10%? Always start charging when the battery gets to like 40%?
One question i have for the Nexus 7 2013. Is it even possible to remove the battery for this tablet or does it void the warranty? Second has anyone purchased a spare battery (if possible) for their Nexus 7 2013? If you did could you post a link to where you got it and let us know how much you paid?...
Great question and thread!
-droidshadow
Click to expand...
Click to collapse
What I said was that, theorically, in a perfect world, you want to charge your tablet when it starts losing charge and ideally never let it get below 90%. This is almost impossible because we use our tablet and we don't want to constantly be charging it so ideally you want to charge it whenever you can.

Did the note7 battery fiasco made you more wary of Li powered devices?

Speaking for myself I've always been kinda aware of the failure potential of these batteries. For instance, I tend to not leave the phone unattended during charging and also use such tasker profiles as to shutdown when charge below 5% or alert when charging above 95%. These latter measures and others are mostly to help with battery longevity as well as or rather my ocdness on this subject.
My only gripe is that I never succeeded in instilling the same 'respect' for battery in my wife.. Pre or even post-note she always forgets her tablet or her phone plugged in the charger, even when no one's at home, sometimes for days!
But this recent note7 'mishap' let me tell you, made me even more wary of the destructive potential of the batteries in our phones. Especially since most of my latest snapdragon devices (m7, z5) get very warm while performing various mundane tasks (syncing via wifi/lte, camera, games rendering etc), much warmer then the defunct note.
Did this event affect the way you use your mobile devices and how? Is there any particular strategy you use with this respect? Or do you rather think that the failure rate being so low it's rather silly to worry about it?

millicent said:
Did this event affect the way you use your mobile devices and how?
Click to expand...
Click to collapse
Nope, it hasn't made me change anything so far. I don't believe the issue with the Note 7 is directly a result of the battery since Samsung had two manufacturers make batteries and in both instances Note 7 devices with either battery still failed.
Is there any particular strategy you use with this respect?
Click to expand...
Click to collapse
As long as the device is working properly meaning there's no defect that I am aware of (as in no global recall in effect, etc) in any part of the power or charging systems then I tend to leave my devices plugged in until they charge to 100% status then I'll usually leave them connected to the charger for up to 30 minutes past that point then disconnect. With the GS7A I have, I only charge it once every 2.5-3 days typically and that's from 5-10% back to 100% using a Samsung 2A charger - I don't use the factory fast charger and I don't use fast charging because I believe that ends up shortening the potential lifespan of the battery cell itself.
I did not say that's a fact for everyone to live by or accept as the gospel truth, I said for myself personally I believe that fast charging shortens the lifespan of the battery cell itself.
For the record I've owned several hundred devices over the decades, some with Ni-Cad batteries, most with Li-Ion over the past decade, and a few with Li-Po technolology and I only had one instance of a battery having a problem (not a failure). It was a knockoff cheap Chinese clone battery for my Galaxy S4 Active several years ago and it bloated up one afternoon - thankfully that GS4A had a removable back cover and I caught the swelling up very fast because as soon as it started to bloat up the back cover literally popped off about 4 inches above my desk and landed on my keyboard. I of course took the battery out immediately and put it in a small ceramic box my Wife had laying around, nothing else happened and I ended up taking it to a local battery store here in Las Vegas and turning it in for safe destruction.
See, there really is a good reason to have removable batteries and removable back covers on some devices.
Or do you rather think that the failure rate being so low it's rather silly to worry about it?
Click to expand...
Click to collapse
As stated above, I don't believe the actual point of failure with the Note 7 is the battery directly - the burning up and explosions of the battery cells is the effect, not the cause. Something is happening to cause the battery (now two different ones, which most of us know about now) to fail.
Now it remains to be seen if the cause can be determined for the failures.

There is one other, perhaps more placebo induced effect, routine I'd do every once in a while, related to battery calibration. So I'd let the battery go as low as can possibly go, or let it turn off by itself, charge at cold until 100% then power on while still plugged in and finally unplug when os fully booted up.
Is this still a proper thing to do or it rather stresses the battery uselessly?

After I got this GS7A I did allow it to run down entirely till it shut off once, just one time and I actually got concerned because when I then plugged in the charger all I got on the display was a battery outline (the white battery icon that's hollowed out) and I was expecting the lightning-bolt symbol to appear there to indicate yes it's charging, after which it should change into the progress meter along the inside bottom of the icon.
That didn't happen.
So I sat there waiting. 5 minutes went by, then about 10 minutes, and I started to worry that perhaps I'd just killed it completely. But about 11 minutes after I plugged in the charger the lightning bolt appeared for about 10 seconds, flashing a few times, then I saw a thin green line across the bottom. Success!
But it did pretty much scare me for a few minutes at the thought of potentially ruining it by doing that so, I don't intend to ever let that happen. Your practice you mentioned of using Tasker to shut down at 5% (not a complete discharge like I did that one time) and to stop charging at 95% is a good idea and something I'm going to have to do more research into.
I've spent a lot of time over the years reading research papers at Battery University and I know that full discharge of a Li-Ion cell is a bad idea but I still ended up doing it. I was actually trying to capture a screenshot at 1% then I planned to initiate a shutdown immediately after that but taking the screenshot just killed it, oops.
But the idea of shutdown at maybe 4% and stopping the charging at 95% (or at least providing me with some kind of alert I can hear clearly and charge or disconnect as required) is a very good idea so thanks for mentioning that.
My research and understanding of the available info at Battery University is that it's better to do your best to not let a Li-Ion cell go below at least 30-40% charged most of the time with short periods of charging to bring it back up to the 90-95% point and, and occasionally - like maybe once a month - allow it to go deeper into the discharge state but not fully (I learned my lesson on that one) and then charge it back to full. The question is what that "full" point might be because some papers say charging Li-Ion to full capacity ruins them as time passes and other papers say it's just fine to do so occasionally - the problem is there's no absolute consensus on either method.
The deep discharge method once a month might work better as a method of calibrating (?!?!) but I honestly don't know for sure, not sure anyone does. But I think I'm going to start using Tasker for that 4-5% shutdown and 95% top off point on my Active, it sure can't actually hurt the device and could give me longer battery lifespan or should I say longevity as you did - that word actually seems more appropriate because most folks hear "battery lifespan" and they only understand that to mean how long it runs on a single charge which isn't the meaning I'm trying to get across.

all i can say after this incident , my knowledge of ion battery deepen and yes in case of emergency , you cant remove if its seal tight shut inside , something to consider , Samsung .

for me, no it's not made me more wary, I always am re Li cells as there have been many failures not only in phones. I have laptops, eCigs, torches etc that all use Li cells. That said, I use the devices as "normal" but stay aware of how warm they've gotten in charge/use, try to not drop them or leave them on/in a source of external heating etc. Anything containing combustible material can go bang after all. A disposable lighter left on an iron fireplace with the fire burning goes bang very well indeed, as would one of these cells in the same circumstances
I tend to top off the charge regularly since I have Qi chargers on my desk and in the car holder but never charge overnight while I sleep. I'd guess my operating capacity ranges from 100% down to maybe 30% and mainly hanging in the 60-80% range as the device tops up. SatNav tends to mean in-car the device only gathers a minor gain even over a couple hours use as the draw from the screen/cpu offsets the input from the Qi charger plate. The phone of course gets warm in this mode, hence it is set halfway down on the centre dash rather than up high and in the sun. And no I'm not always looking at it - voice guidance is very handy
On charge levels, I've also read a number of articles on various cell types. Typically the recommendations are that Li cells effectively eat themselves if kept at 100%, degrading and losing capacity over time. Hence its best if storing them to have them at 50-70% and not fully charged. Of course whether the phone actually takes the cell to its 100% limit or its charge management calls 100% at the 95% of cell capacity I don't know. When fully discharge has happened then yes it does seem to take longer for the charge icon to start ticking along, seen the same on the old iPad-1 I have, probably because the initial part has to be a very slow energising charge to get the cell to a point when it can accept more current and maybe the icon only shows rates above a certain current.
re the swelling cell. I've not used non-Samsung cells in my note 1/3 or S2 but have seen Sammy's cells also swell when they get to end of life. Both notes had this happen around the 18-26 month mark but not to the extent of the back popping off/open. Dramatic shortening of on-battery runtime yes, but from the outside no real visible indications that anything was up.

NO, LiPo, and Li ion batts are everywhere why worry about, I have had dozens of LiPo an LiOn powered devices

What about Li-On batteries though?

Hasn't changed for me either. But it has made me more wary of Samsung devices. There no way I'm getting the s8 (or note 8) no matter how great the features are. They can't even figure out what's wrong with the note 7.. Who's to say their upcoming phones won't have the same problem.

The only thing that worries me is that it may become even harder to get batteries and such shipped to Hawaii, it's horrible.
Sent from my SAMSUNG-SM-N930A using Tapatalk

[Q] Battery level is incorrect only in bootloader?

Hi,
Recently my Redmi Note 8T battery percentage acts weird, after I had it charged to 86%, it quickly dropped to around 50%, then it turned off itself, bootloop-ing countless times.
Strange enough if I have it plugged to any power source it would turn on, but as soon as I unplugged it, it turned off, sometimes immediately, sometime after usage of 2-5 minutes.
My phone is unlocked, and for years I never use root except to restore data. Only custom roms + gapps. And my storage is not encrypted (use dfe).
I know it's battery problem, but my main question is: I'm able to enter twrp or ofox, and it shows battery percentage.
And while in recovery, it never turn off itself, it's like the battery is working properly, I'm able to use it for long time, tried 1-2 hours before I hit power off from recovery.
But as soon as I hit reboot to system without any charger plugged in, it's bootlooping again.
I tried to swap to different kernel, they didn't help. So I suspect the issue isn't coming from kernel.
Just somehow the battery percentage stored in bootloader (?) or something else and the percentage read by twrp/ofox is different
What I'm able to:
1. Boot the device with charger plugged in
2. Boot to any recovery
3. Boot to fastboot
What I haven't do yet:
1. Flash back original miui EEA
2. Format data
3. Let the battery empty and charge it after it
I'm not sure about format data would help, I just do clean flash every time change rom.
About flash to miui, I noticed sometime phone displays the original offline charging indicator (the big battery icon with color) shows empty when rebooting (just before going bootloop).
But when I offline charge (using custom roms) and got different display of offline charge (I believe the custom offline charge from the roms), the percentage shows the same as being shown in twrp/ofox.
Does anyone here knows maybe how to reset/recalibrate battery level in the bootloader (?, again I'm sorry, I'm not sure where it's located) so it can show correct data as same as what being read in recovery?

That's sign of your battery is dying. There is plenty of thread about it in this forum also with different phones.
Just replace the battery, or you can bypass the fuse(?) on the bms if you don't want to replace the battery, idk how safe it is though.
You already know it, its not software issue, you cannot recalibrate, there is no way around it
I just facing same issue for the past few days, I tried everything i can from software side, nothing works. In the end, I just replace my battery and now everything working just fine.

SkyFlex said:
That's sign of your battery is dying. There is plenty of thread about it in this forum also with different phones.
Just replace the battery, or you can bypass the fuse(?) on the bms if you don't want to replace the battery, idk how safe it is though.
You already know it, its not software issue, you cannot recalibrate, there is no way around it
I just facing same issue for the past few days, I tried everything i can from software side, nothing works. In the end, I just replace my battery and now everything working just fine.
Click to expand...
Click to collapse
Yes, I was wondering if there's anyway to fix it without going to service centre or DIY opening its backcover and change the battery, lol.
I never heard of bms, what is it?
As for now, I have left it more than 24 hours on ofox and the battery is not drained yet, so obviously, the battery itself still has some juiced in it yet cannot be used outside recovery/fastboot mode.

x3r0.13urn said:
Yes, I was wondering if there's anyway to fix it without going to service centre or DIY opening its backcover and change the battery, lol.
I never heard of bms, what is it?
As for now, I have left it more than 24 hours on ofox and the battery is not drained yet, so obviously, the battery itself still has some juiced in it yet cannot be used outside recovery/fastboot mode.
Click to expand...
Click to collapse
Its Battery Management System. A little board mounted on the battery.
What bms does? The name is self-explanatory, that little board have responsibility for protection, monitoring like thermal, battery health, regulate charging and discharging, something like that.
Probably because in recovery/download mode it didn't draw much power from the battery compare to booting up device or doing heavy task. So the bms like "Alright, that's safe enough".
If you want to try to "recalibrate", try deleting batterystats.bin under /data/system, also under battery-history and battery-saver folder

SkyFlex said:
Its Battery Management System. A little board mounted on the battery.
What bms does? The name is self-explanatory, that little board have responsibility for protection, monitoring like thermal, battery health, regulate charging and discharging, something like that.
Probably because in recovery/download mode it didn't draw much power from the battery compare to booting up device or doing heavy task. So the bms like "Alright, that's safe enough".
If you want to try to "recalibrate", try deleting batterystats.bin under /data/system, also under battery-history and battery-saver folder
Click to expand...
Click to collapse
Nah that "calibrate" process was a placebo, it was known for it long ago. Anyway, your hunch is correct. The battery's fuse was blown. Had to replace the battery, don't want to mess with solder.
I was quite surprised as my daily usage never been heavy and I'm quite careful using it. I never play any games on the phone. Never use it when it's being charged. Rarely overcharged it. Charge always around 20-30% to 85-92%. Use original charger, just recently I switched to Xiaomi 33w. Yet still the fuse was blown after all. Not sure whether the 33w charger was the culprit.

x3r0.13urn said:
Nah that "calibrate" process was a placebo, it was known for it long ago. Anyway, your hunch is correct. The battery's fuse was blown. Had to replace the battery, don't want to mess with solder.
I was quite surprised as my daily usage never been heavy and I'm quite careful using it. I never play any games on the phone. Never use it when it's being charged. Rarely overcharged it. Charge always around 20-30% to 85-92%. Use original charger, just recently I switched to Xiaomi 33w. Yet still the fuse was blown after all. Not sure whether the 33w charger was the culprit.
Click to expand...
Click to collapse
Same case here, I used 18w charger ( Aukey PA-T9 ) never charge below 20-30% since I bought this device, I'm pretty sure my battery wear still quite good, the battery also physically good not swollen, just the fuse. Although for the last few months I've been using the phone while charging ( watching live stream on Twitch ) which I know the app is used high cpu usage compare to youtube/local video player ( MX player )
Probably not, but who knows, I don't want to dig deeper what cause it, I'm not knowledgeable about electrical, but I do think the fuse worn off for some reasons and blow under normal loads.
For me its been around 3 years, the battery need to replace anyway.