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] Battery issue

I have my i9250 on CM11, fancy kernel and one of the latest twrp recovery.
I just changed a battery from original one (1750mAh) to slightly bigger one (2000mAh).
Once I tried to fully charge it, it got stuck at 90% and charging process turned off, like the battery was fully charged.
Is there anything I shall do? Like calibration (if so - how to do it?) Or is it the battery that is being screwed and I shall get it replaced.
New battery is not original Samsung battery. It says to be Li-ion battery.

Try to completely drain the new battery and then charge it, without unplugging it, to 100%.
Break me off a piece of that Kit-Kat ROM!

TheMan0790 said:
Try to completely drain the new battery and then charge it, without unplugging it, to 100%.
Break me off a piece of that Kit-Kat ROM!
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Tried that solution, drained it down to 4% and then tried to fully charge. With no success, stuck on 89%.
I will call on for battery replacement.
And hey, grab that piece
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Hmm...sucks to hear the problem isn't fixed. Does sound like the battery isn't getting a complete charge. But hey, I will grab a piece of some Kit-Kat!
Break me off a piece of that Kit-Kat ROM!

Maybe discharge it to 0% till it shuts off and then charge it. If that doesnt work try clearing batterystats (sdmaid has that option for example).
Sent from my Galaxy Nexus using XDA Premium HD app

try to power off your device and remove the battery, for 3 mins or more then insert back and connect your charger untill its fully charged

Since its li.ion battery it shall not be fully discharged, may and probably would battery.
Waiting for new battery, probably will get it tomorrow and then will flash new snapshot of cm11 with full data reset. Hoping for positive results

Change thread name as I guess it is no longer battery calibration thing.
Got another battery and problem persists.
Let me describe the whole story from the beginning.
With my maguro, about 4 months ago, on original battery I noticed worse battery performance. It was getting worse and worse but fairly slow. After about 2,5 months (6 weeks back from now) my phone stopped charging up to 100%. The highest value it would get was 94% and then it would turn off charging. I thought that my battery is dying. After another 3 weeks it would charge up only till 90% and then stop charging. I decided that its about right time to change the battery.
Found substitute with 2000mAh. And the rest of the story is above. It would not charge till 100% (would charge only up till 90%), so I thought that the battery is dodgy. Got a replacement. With new replacement of battery I decided also to do clean flash of new 20140107 CM11 nightly. After clean flash I still get the same problem - my phone does not charge up to 100%.
Checked under *#*#4636#*#*: it says it is Li-ion battery, so in line with what it says on the new battery package (at first I thought they might be selling old types of batteries [ni-cd or ni-mh] under Li-ion labels).
Do you have any idea what to do?
Please be aware that I have already tried:
- draining and then fully charging;
- charging phone with phone switched off;
- gave a phone few minutes with battery out so it could somehow "forget the past";
- different chargers (dc charger, usb charger, car charger);
- resetting battery stats
Anybody any help? Solutions? Same problems in the past?

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. ?

[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.