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?

** Community Battery Life Tips & Tricks **

While we have VOOC and (some of us) a spare battery lying around, we could all use more battery life when we're away from a wall outlet. So..
Post your battery stats/power consumption details along with any steps you took to achieve it.
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Enjoy all.

Here's my battery results after a full day's use.
Stock Oppo Color OS
Stock Kernel
Google Now OFF
Low Manual Brightness
Bluetooth On
GPS On
Keylights Always OFF
Vibrate on Touch OFF
Greenify: NONE
Snapdragon Battery Guru: LEARNING
[There is a very small part where the battery charged while attached to a computer due to syncing over a few songs. I only seem to recall that battery going up by 1% at this time]
Anyone have any suggestions?

After installing snapdragon battery Guru i mentioned verry low speaker audio during phone Calls. uninstalling fixed the behavior.
anyone else.
?
Sent from my X9006 using XDA Premium 4 mobile app

That was with about 3 hours of gps on and using Google maps and a route planner for my deliveries today. I don't know if that's good as I've yet to use it like this before.
I have all off screen and on screen gestures turned off except the 3 fingers for screen shot. Auto brightness and wifi was off today as well.
The other day I let my phone idle for 9ish hours while I slept and I lost 4%, that was also putting the cell data to edge though.
I also use the greenify app, not the built in greenify. Haven't messed with the built in greenify does it work the same way?
Tapped out on my beastly OPPO Find 7a

This has got to be a bug...
Unplugged, drove to work and noticed no drain on the monitor.
The phone was trickle charged by my router though overnight, not through the OEM charger

I disabled the gestures, that helped a lot.

how long does your battery get charged with the flash charger??

reyscott1968 said:
how long does your battery get charged with the flash charger??
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100%

gielsgaard said:
100%
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what 100%?
i was asking how long does your phone charge to get 100%???

reyscott1968 said:
what 100%?
i was asking how long does your phone charge to get 100%???
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from 50 to 100 takes 20 minuttes.

Sorry folks, but there is already a thread for this here...http://forum.xda-developers.com/showthread.php?t=2750001

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. ?

Is there any way to limit CPU usage to 70% WITHOUT disabling auto-sync?

If only Power Saving Mode let you choose whether to disable or enable auto-sync. Is there any way to somehow enable Power Saving Mode (to limit CPU to 70%) without disabling sync? I can't miss notifications but want to save some battery.

Running in anything lower than the optimized power setting really screws the N10+ up. More of an emergency measure than a normal operating state.
With a good battery you should be getting 10+ hours SOT if optimized... and days of standby time.

blackhawk said:
Running in anything lower than the optimized power setting really screws the N10+ up. More of an emergency measure than a normal operating state.
With a good battery you should be getting 10+ hours SOT if optimized... and days of standby time.
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I get 5-6 hours MAX of SOT and 6 is pushing it. AccuBattery has my health at like 93% so the battery isn't bad by any means. I regularly let the phone put unused apps to sleep and I never game.
I really just want to find ways to squeeze the most life out of battery without crippling my ability to get notifications as they arrive.

Something not right. Even with a degraded battery needing replacement I get a lot more than that.
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3440 mAh is 80% of the battery's original capacity and the end of its useful service life.

blackhawk said:
Something not right. Even with a degraded battery needing replacement I get a lot more than that.
View attachment 5798267View attachment 5798265
3440 mAh is 80% of the battery's original capacity and the end of its useful service life.
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AccuBattery's estimate for mine seems a bit worse than yours, but 10 hours of SOT isn't something I've ever been able to get. My estimated capacity is 3,908 (94%) of 4,170 mAh.

izzysomms said:
AccuBattery's estimate for mine seems a bit worse than yours, but 10 hours of SOT isn't something I've ever been able to get. My estimated capacity is 3,908 (94%) of 4,170 mAh.
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That's not bad. It needs to be optimized more if you want to increase the SOT.
Try temporarily disabling Google play Services when not needed. It's needed for Gmail, Google backup Transport and Playstore but not much more. I always have Playstore disabled as it's a troublemaker. Any cloud apps running in the background are also skewing the battery life.
I use manual brightness control; excessive brightness wastes battery and pixels. I use dark mode and themes to conserve display, battery and eyes. Also use Package Disabler to disable about 70 apks I don't use.

[FP4][LOS20] Absolutely atrocious battery life. Phone dies every night it's not plugged in

Hi guys
I moved to LOS in the hopes of improving battery life but it's been pretty bad. I'm at my whits end. I tried using PhoneProfilesPlus to turn off all sensors and radios overnight but it didn't help. My phone literally burns through battery after every even small charging cycle. I used GSam Battery Monitor but couldn't identify any specific app to be the culprit either.
Last night I even used "Battery Tool" to stop most all apps as well as "SaverTuner" to change the Doze mode settings but even still I get the following usage curve:
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Btw the times seem to be completely off too. The last charging spike was around midnight.
I also noticed that Wifi won't show as "off" in the stats unless I reboot my device. But doing that didn't change anything either. As you can see, after I rebooted in the evening, the curve was practically flat. After charging a bit and unplugging before sleep though the phone immediately started draining again.
Any help is very appreciated. It seems I can't go back to stock bc of the A13 bootloader but battery life wasn't much better on stock either.

You also have other helpful charts in Gsam.
What do you mean by "unplugging before sleep"?
Turn off your phone completely overnight and compare the charge before and after.

I meant that I don't leave the phone plugged in overnight. Sadly I can't really gleam anything helpful from the statistics. I'm going to try and charge it to full before this night and set a custom reference point

Looking at that graph, do you have your screen always on? The 2-3 hours around midnight show screen on, but no battery drop. I assume you had it on charge at that point?
What charger are you using? I use an Anker 5 port Quickcharge 4 charger with a USB-C cable that has an LED display to show the charging wattage. I usually get 18W (9V*2A) which pushes charge in quite quickly.
I can't speak for LOS20 as I'm on stock A12, but the battery does seem to discharge faster than you expect.
I use AccuBattery to monitor the power usage and charge/discharge history. Put it this way, I find I do a number of smaller charges through the day. Driving along, I'll have the phone hooked up to the Android Auto slow charging it while I'm using it. I get home and I'll stick it on charge for 45 minutes to boost it up from 20% to 80%.
The rated capacity of the battery is 3905mAh, and AccuBattery is estimating my current battry capacity at 3443mAh, a reduction of 12% in 9 months. That's with only charging between 15% and 80% most of the time. I'll give it a 100% once a month or so.

Thanks for your replies!
I'm thinking something is really wrong with deep doze in my case. I charged my phone fully and got to 50% in a day's use. I made a point of not plugging it in at all because normally you'd expect it to survive on half a battery but no dice. it just starts burning through battery suddenly.
I'm honestly unsure about this graph too. I certainly didn't use the phone and the screen until 2am. I might need to look at other apps too but that doesn't change that my pone went from 55% to 0 in about 6h.

NiPfi said:
(...) I certainly didn't use the phone and the screen until 2am. (...)
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You didn't have to use. Apps and services do it for you.