Develop Bugs

[Q] Is it possible to create a "bump charging" kernel?

http://phandroid.com/2010/12/25/you...is-lying-to-you-and-its-not-such-a-bad-thing/
First of all, bump charging is not good for your battery, but considering you can buy one from ebay at the same cost as a hamburger combo meal, I think I am willing to skip a lunch to replace my battery every year.
One technique that has gained popularity in the user community is “bump charging.” To bump charge a device, turn it off completely, and plug it into a charger. Wait until the indicator light shows a full charge (on the ADR6300, for example, the charging LED changes from amber to green) but do not yet turn the device back on. Instead, disconnect and immediately reconnect the power cord. The device will now accept more charge before saying it is full. This disconnect/reconnect process can be repeated multiple times, each time squeezing just a little bit more into the battery. Does it work?
The following chart plots battery depletion after the device has received a hefty bump charge (6 cycles) and then turned on to use battery power. Note that the system does not show the battery dropping from 100% until well over an hour of unplugged use, at which point it starts to steadily decline. Again, however, it should be obvious that the battery gauge is not syncing up with reality. How could the rate of depletion be increasing over the first 5 hours while the rate of current draw is relatively steady? And why does the projected battery line separate from the reported levels, but then exactly mirror the later rises and falls?
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The answer, of course, is that bump charging definitely works. Rather than anchoring our projected values to the first data point of 100%, what happens if we anchor against a later point in the plot?
Aligning the data suggests that a heavy bump charge increases initial capacity by approximately 15%. Note that the only other time that the lines separate in this graph was once again when the phone was put on the charger and topped up to 100%. Just as with the first set of graphs, the phone kept reporting 100% until it was unplugged, dropped rapidly, and again caught up with our projections.
So what does it all mean?
If you absolutely need the highest capacity on a device like this, you will need to bump charge. There are currently people experimenting with “fixes” for this, but I have yet to see one that works. Be warned, however, that repeated bump charging will wear your battery faster and begin to reduce its capacity. If you are a “power user” who will buy a new battery a few months from now anyway, this presumably isn’t a concern.
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Check out the second post, v8-beta.
http://forum.xda-developers.com/showthread.php?t=876590

_MetalHead_ said:
Check out the second post, v8-beta.
http://forum.xda-developers.com/showthread.php?t=876590
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Sweet!!! I will be testing that kernel this weekend! HNY!

Neo3D said:
Sweet!!! I will be testing that kernel this weekend! HNY!
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How has this been working? I was using a V7 Kernel from that site that used TRICKLE charging.. NOW I read about the bad effects of trickle charge and batteries so I decided to try BUMP CHARGE since it doesnt leave voltage on the batery all the time. I jut know know the effects of bump over trickle and if one is better/safer then the other..

any update?

[Q] Odd Battery Charge Curve

hi all,
i noticed the charge curve on my evo is not linear. at first it's logarithmic and then linear (see pic). everything is off (3g/4g, wifi, bluetooth, sync) while charging (only turning on once in a while to check the %). is this normal?
ive wiped my battery stats and done all that. during use, the battery drops to 60% quickly and then discharges slower. im using deck's gb 1.3 rom, havent changed the kernel, no wake lock issues as far as i can tell.
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I was having the same exact issue. I bought a new battery and figured it must be bad when it would jump from 80 percent to full in a matter of minutes. Then it would discharge to around 70 percent in a matter of an hour. After it hit 70 percent it would discharge more slowly. This was a battery that the Sprint store gave me and I was led to believe it was new. After it did this weird charging discharging issue I went back to sprint and this time received a brand new battery in the package. The young lady behind the counter showed me a box full of all types of used batteries and explained they probably pulled one out of the box of the used batteries. I exchanged my original battery because it wasn't fully charging anymore but the weird charging spike I got with the replacement battery was a first for me. Anyway the "NEW" battery is working like it should so you may be looking at a bad battery.

I know you said you wiped battery stats but did you calibrate the battery at all?

oop. forgot all about this post. thanks for your responses.
i assumed something weird may have happened from my going stock to root so i checked out a friends battery. he never rooted his phone. unfortunately i get the same charge curve.
yes, i have calibrated my battery/ ie, charge to full, wipe stats, then drain phone til shut off.
i will try contacting sprint/htc for a new battery and see how that goes.
anyone else have this issue?

Me, all the time. Have yet to have a different curve ever. Mine happens a little higher though, around 70%. Try battery monitor widget and you can see the actual charging voltage
Sent from my PC36100 using XDA App

I use SetCPU with 3500mAh battery and last 28hrs on single charge
Sent from my PC36100 using XDA App

plobukt said:
oop. forgot all about this post. thanks for your responses.
i assumed something weird may have happened from my going stock to root so i checked out a friends battery. he never rooted his phone. unfortunately i get the same charge curve.
yes, i have calibrated my battery/ ie, charge to full, wipe stats, then drain phone til shut off.
i will try contacting sprint/htc for a new battery and see how that goes.
anyone else have this issue?
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After you drain the battery completely, charge it to 100% without unplugging. Recalibrate with that method and see if it helps.
Supersonic Evo 4G | MIUI | Tapatalk

[Q] Sudden Dead at 65% battery, anyone can help please?

Hi All,
I have experienced something wrong with my HTC one x (upgraded OTA). It is off automaticly when reached around 40-60% battery. it happens randomly but mostly around it.
when i turn on again, it is just start till the unlock screen and it suddenly OFF again.
I have to plug the charger first and start again to make it live.
when i checked the battery while charging from the sudden death. it is charging from 35% power which it means there is still a lot of power.
when it is charged full to 100% it is automatictly off again when reach around 40-60%. In these case it off at 65%, please take a look at my battery log at the attachment.
Does anyone experience the sama thing, please help me to figure these out.
thank you so much for the attention.
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kn33cow said:
Hi All,
I have experienced something wrong with my HTC one x (upgraded OTA). It is off automaticly when reached around 40-60% battery. it happens randomly but mostly around it.
when i turn on again, it is just start till the unlock screen and it suddenly OFF again.
I have to plug the charger first and start again to make it live.
when i checked the battery while charging from the sudden death. it is charging from 35% power which it means there is still a lot of power.
when it is charged full to 100% it is automatictly off again when reach around 40-60%. In these case it off at 65%, please take a look at my battery log at the attachment.
Does anyone experience the sama thing, please help me to figure these out.
thank you so much for the attention.
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Uhm I'd suggest you try a battery recalibration, it might be some issue with the software! Try letting your battery drop to 0 % (I really mean that the phone falls out because of zero power, then reboot it untill it no longer reacts), then the phone is completely empty.
Then recharge it again to 100 % (let it charge for about 8 hours).
But to make sure you bettery just google "battery calibration" for a good guide on it!

H-Cim said:
Uhm I'd suggest you try a battery recalibration, it might be some issue with the software! Try letting your battery drop to 0 % (I really mean that the phone falls out because of zero power, then reboot it untill it no longer reacts), then the phone is completely empty.
Then recharge it again to 100 % (let it charge for about 8 hours).
But to make sure you bettery just google "battery calibration" for a good guide on it!
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thank you so much for the tips, right now i will try to make it really empty and charge. one question when it is already full should i unplugged the charger first and then calibrate or i just calibrate with the charger plugged on?

it is still happen and my phone shuts down by itself randomly around 40-60%.
is there any other solution i can do to get rid these battery case anyone?

Have you tried clearing Battery stats in recovery, then let it drain till the phone shuts down, then charge till full while the phone is still off... The LED will turn green once it's full...
If still same problem, charge till full again, turn on Airplane mode and run the battery test, on your dialer key in *#*#3424#*#*, click "Accept" then on bottom right tap on "More", select Battery test and click run

my battery pass the test but the status of it still error. it will shut down by itself when comes to 40-60% randomly. TT i have never experienced my phone low battery or red. it dead already around 40-60 so i should charge it.

I posted that then I saw your thread:
http://forum.xda-developers.com/showthread.php?t=1706811

Premature Shutdown & Random Unlock Problems

Hi all, I posted in the battery life thread but didn't get any bites, so I thought I'd go up a level.
I have had two warranty replacement M8s which behave similarly. Both will occasionally not unlock with the power button, though the phone will still take a screenshot of the "unlit" screen by way of the Pwr/Vol- combination. Leaving it for a number of minutes will usually see it unlock normally. Is it conceivable that in-app misbehaviour could cause this? I would have thought that unlocking the screen is a higher priority event than a screenshot...
The second problem is that the phone shuts down at around 15% battery remaining (according to the display), but when plugged in to the genuine charger it is 0%. Oddly, whilst the phone is powered off between going flat and being put on charge then restarted, the battery manager reports that WiFi remained active. Furthermore, the phone continues to display "XX Hours on Battery" from the previous power cycle.
Screenshots should help:
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I have apparently expired the number of express turnaround replacement handsets and am being told that I must return the handset for analysis. I'm pretty annoyed as I've already been inconvenienced, and am interested in getting an insight from members as to where they think the problem might lie.
I have recalibrated the battery a number of times, the battery test function finished at 90% and I only use the supplied charger.
Many thanks,
Steve

Barboots said:
The second problem is that the phone shuts down at around 15% battery remaining (according to the display), but when plugged in to the genuine charger it is 0%. Oddly, whilst the phone is powered off between going flat and being put on charge then restarted, the battery manager reports that WiFi remained active. Furthermore, the phone continues to display "XX Hours on Battery" from the previous power cycle.
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The phone shutting down at 15% doesn't seem that unusual. The % reported by OS is not a precise number. Its simply an estimate of battery remaining based on current voltage versus how you use your phone (or at least, how the phone thinks you will use it). Its an abstract number, and just what the manufacturers have come up with; since they probably decided that most folks aren't smart enough to understand battery voltage.
You shouldn't be running your battery down that low on a regular bases, anyway. Short, frequent charging is best for long-term battery life with Li ion batteries.
My phone shutoff at around 11% the other day (didn't realize my kid ran the battery down that low watching videos), and it really didn't strike me as that unusual.
The screen not turning on, on the other hand, is a more unusual. Possibly try RUU, if your version has one available.

Interesting... thanks for that Redpoint. I appreciate that running lithium ion batteries to dead flat isn't ideal for longevity, but my last two HTCs would happily go into single digit percentages. For example, my original M8 on Android 5 would go through displaying the red battery symbol, the hollow one and I think another one after that at 1% if I pushed it to. I also didn't elaborate, but actually using the current phone at around 20% battery will result in it clock down maybe 4% every subsequent 15 to 30 seconds. That's an excessively fast taper-off.
I'll look up what RUU means ?... I am a noob.
Cheers,
Steve

Just wanted to say that those three characters "RUU" helped a lot. I now have an option other than sending it back.
Much appreciated mate. ?

Question Protect battery option

How many use this option? If so, is it worth stretching battery life to decrease the time between charging?

Really its the first time i saw it.
I left it off.
I use all my phones the same and havent seen any battery problems.
So i dont see why this one should be different

I turned it on for a day, but this isn't the biggest battery on the market, so I'm leaving it off.

I use it. Prior to this being baked into One UI, I got into the habit of charging my devices to 80% and it grew on me. It's a tip I got from the Accubatery app. It's a simple way to add less wear to your battery.
Oddly, my phone fresh out the box with only 5 charging cycles from 15/20% to 80% has an 88% battery health score. My Fold2 which I had since launch has a 96% battery health score...

There is no consensus as to whether to use this option?

ronaldheld said:
There is no consensus as to whether to use this option?
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It's all dependent upon how you use the phone. Turning it on will absolutely be better for your phone, but you will lose that 15% battery life. Your charging habits also matter. If you're a person that just always puts it on a charger when not using it, you would see more improvement from turning it on than someone that only puts it on the charger when it's low. The benefits are minimal. It shouldn't largely matter, but if you keep the same phone for many years it will help improve its life.

It's early days with the device so battery performance is still an unknown for a while longer, but I enabled the battery protect option from the start. As of yesterday I'm able to get 5 hours of SOT with the maximum charge at 85%. That performance holds up over time and I'll end up leaving the option enabled.
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It is a very useful function. I think maybe I'll introduce the Note20 Ultra as well. What version does the Samsung Device Care application have for you?It's me 12.3.00.30.
Thanks!

ronaldheld said:
How many use this option? If so, is it worth stretching battery life to decrease the time between charging?
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I use the protection when I'm home, 5 days a week. I just place the phone on a wireless charger when not in use during the day.
When I'm going out, I'll turn it off to get the full 100%.
Frankly I love the option to do this. I used to use an app that notified me at 90%. Now I don't need to bother. My only gripe is that I can't easily set a toggle for the setting. I'm planning on finding the setting name with adb and using tasker to create a toggle, preferably on a weekday frequency

I turn it on because I usually charge overnight. Leaving phone trickle charging at 85% is less detrimental to battery compared to 100%

i use it, still got 5hrs sot

Got a doubt. Does the Battery Protection Mode works when the phone is charged in switch off state ? By switch off I mean completely switched off not just locking the screen of the phone.

ben cherian said:
Got a doubt. Does the Battery Protection Mode works when the phone is charged in switch off state ? By switch off I mean completely switched off not just locking the screen of the phone.
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works with off state.