Develop Bugs

First charge

Hey guys! Just gotten my note 2, and gonna drain the battery down soon, should I plug it in and charge for 8 hours straight from zero? Should this be done with the phone off? Or this doesn't matter anymore?
Sent from my GT-N7105 using xda app-developers app

Doesn't matter anymore...

I usually do it. Zedomax recommends it, and it doesn't hurt anything to do so.
Sent from my SAMSUNG-SGH-I747 using xda premium

Is it alright I do it with the power on?
Sent from my GT-N7105 using xda app-developers app

This is not needed anymore.
if the battery takes to long to kill then simply its already calibrated
many people don't know how a none-calibrated battery acts and think "battery life is great but it will get better later!"
if anyone of you happened to have a nokia phone in year 2000ish and still have it around i recommend you to go get a replacement battery for it and see for your self
unless the new battery jumps from 100% down to like 80/70% in no time then take too long to drain from 10% or something like that (in short battery acting weird)
then its already calibrated which is the case in all new phones/batteries
TL;DR
unless the battery is acting weird and not taking too long to kill then you dont need to do that

Hell Guardian said:
This is not needed anymore.
if the battery takes to long to kill then simply its already calibrated
many people don't know how a none-calibrated battery acts and think "battery life is great but it will get better later!"
if anyone of you happened to have a nokia phone in year 2000ish and still have it around i recommend you to go get a replacement battery for it and see for your self
unless the new battery jumps from 100% down to like 80/70% in no time then take too long to drain from 10% or something like that (in short battery acting weird)
then its already calibrated which is the case in all new phones/batteries
TL;DR
unless the battery is acting weird and not taking too long to kill then you dont need to do that
Click to expand...
Click to collapse
Thanks a lot I got my retail set from a carrier, so glad to have joined the note 2 community coming from the s3 :X so I just charge it up to full as per normal yes?
Sent from my GT-N7105 using xda app-developers app

This charging a long time first usage is also an old thing from the old nicd and nimh batteries..
in fact li-po and li-ion wont even charge after they are done, overcharging them means they explode/burn or get damaged.
there are built in safety features to prevent that.
and pulling it down to 0% means nothing since modern nimh, li-po, li-ion batteries don't got the memory effect.
actually going down to 0% would only test if the low voltage cutoff works as it should or if you damage your battery.

no need for that!
Frostyeo said:
Hey guys! Just gotten my note 2, and gonna drain the battery down soon, should I plug it in and charge for 8 hours straight from zero? Should this be done with the phone off? Or this doesn't matter anymore?
Sent from my GT-N7105 using xda app-developers app
Click to expand...
Click to collapse
Batteries that comes with the latestmpgones these day do not need to be charged for 8 hours!
Just charge it till its full and continue to enjoy it!

You can preserve the life of you battery by not fully charging it and you can damage it by draining completely. I've no source for this information.
Sent from my GT-I9100 using xda app-developers app

Battery Charging

I'm having an issue with my phone.
When I charge my phone; after its fully charged and I pull it from the charger and then the battery discharges faster than normal.
To fix this I have to unplug it and plug it back in until it charges again. Then I will get the normal use out of it.
How do I fix this issue? Is this something with my phone or battery? I'm running stock, non rooted ROM on my SGS3.

phegro said:
I'm having an issue with my phone.
When I charge my phone; after its fully charged and I pull it from the charger and then the battery discharges faster than normal.
To fix this I have to unplug it and plug it back in until it charges again. Then I will get the normal use out of it.
How do I fix this issue? Is this something with my phone or battery? I'm running stock, non rooted ROM on my SGS3.
Click to expand...
Click to collapse
Turn off Data and NFC when you aren't using it.
Sent from my SAMSUNG-SGH-I747 using xda premium

Maybe something wasn't clear. My battery life is significantly reduced when just a regular recharge. When I do a full charge, allow my phone to go to 99 percent, and then fully charge my battery life is normal.
Sent from my tuna version Galaxy Nexus.

phegro said:
Maybe something wasn't clear. My battery life is significantly reduced when just a regular recharge. When I do a full charge, allow my phone to go to 99 percent, and then fully charge my battery life is normal.
Sent from my tuna version Galaxy Nexus.
Click to expand...
Click to collapse
it sounds like a problem with your micro usb flex ribbon. I had a similar issue with my galaxy note 1. It would charge intermittently but eventually I couldn't use it to charge at all and I had to replace it. Have you tried to use another Rom to see if it may be a power management issue too?
Sent from my KFTT using xda premium

Its full stock and non root and I would like to keep it that way. I'll try a different charger though.
Sent from my tuna version Galaxy Nexus.

phegro said:
Its full stock and non root and I would like to keep it that way. I'll try a different charger though.
Sent from my tuna version Galaxy Nexus.
Click to expand...
Click to collapse
when you charge it try to see if charging turns off and on at random. If it does its prolly the flex ribbon
Sent from my KFTT using xda premium

[Q] Battery arc s

So now i bought new battery for my phone because old is ....... I charged it at night to 100% then next morning i went to school. I wasnt using phone but it was heating and there was extreme battery drain. Even if i turn phone off the battery is discharging and phone is heating. So please tell me if is the problem because battery is new or its somthing else?
Im using everything stock, not rooted, only unlocked bootloader.

Are you sure its a genuine battery? Never had this problem.
Sent from my Xperia Arc S using xda premium

tangosierra_ said:
Are you sure its a genuine battery? Never had this problem.
Sent from my Xperia Arc S using xda premium
Click to expand...
Click to collapse
what is genuine battery?

hyper200 said:
what is genuine battery?
Click to expand...
Click to collapse
Google Translate will help you.

pypcier said:
Google Translate will help you.
Click to expand...
Click to collapse
still dont understand it...
If the battery is original or fake?

hyper200 said:
still dont understand it...
If the battery is original or fake?
Click to expand...
Click to collapse
Correct, if it's fake then you need to put in the bin and buy a genuine battery.

Seriously, if your phone still gets warm when you switch it off, I would throw away the battery as far as possible...
Don't you mean standby (screen switched off)?
It still shouldn't get warm when in standby, but then atleast it could be a software problem instead of a possible faulty battery.
Maybe some app keeping your phone from entering deep sleep which drains the battery and might be the cause of the battery drain as well.
Check which apps are using the most power, or just simply factory reset your phone and see if the problem still exists.

If you bought your battery for $5 off eBay or something then chances are its a fake.
If you bought it from the Sony store then of course it's real. (and you should get it replaced)
Sent from my Xperia Arc S using xda premium

I have original battery i ordered it at my operator from germany and it was 30€. When phone is turned off it drains battery. So if i flash kernel and wipe all should help?

If the battery still drains with the phone off (not screen off) then it's advisable to get a replacement.
Sent from my Xperia Arc S using xda premium

its second day after new battery and i noticed that the phone is less heating but still drain battery but not in large amount so i will wait one more day. if wont be better if will root it and decrease processor to 1ghz

and i found another problem. if the battery empty so the fon shut down itself when i connect the chrager it dont start to charge and i cant turn on phone. it take like 3-4 hours to start charging...

I had a similar problem with my sisters galaxy mini... after a few days the only solution that i found reliable was to send it back for repair since it was warranty covered...
Sent from my ASUS Transformer Pad TF700T using Tapatalk HD

hyper200 said:
So now i bought new battery for my phone because old is ....... I charged it at night to 100% then next morning i went to school. I wasnt using phone but it was heating and there was extreme battery drain. Even if i turn phone off the battery is discharging and phone is heating. So please tell me if is the problem because battery is new or its somthing else?
Im using everything stock, not rooted, only unlocked bootloader.
Click to expand...
Click to collapse
first, make full wipe in CWM, if there is problem again, test battery on other phone

[Q] Battery calibration woes

Hi guys. I'm having a heck of a time with my new tab. I appear to have something of a calibration issue with the battery. At the moment, it won't boot without the charger plugged in and displays 42 percent charge when charged while the device is off. I have tried wiping the battery stats via twrp with no luck. It still won't operate without the charger plugged in. The only thing that will work is recovery and sometimes Odin. I checked the battery voltage in twrp via terminal and it displayed 4.3 ish volts. As far as I know, that's the full charge voltage. Why, then, is it not seeing it as fully charged? Any input would be greatly appreciated

Maybe my SGT-7.7 battery scaling (fuel gauge reset) guide will help.
Our tab uses the same fg_reset_cap
http://forum.xda-developers.com/showthread.php?t=2398663
Don't forget the relevant spaces in the command between echo "1" > /sys....... (or just copy/paste it to avoid errors)
Other than that, maybe the battery is defective?
Sent from my SM-N9005 using XDA Premium 4 mobile app

Well, I'm giving the calibration a go. I did manage to get it booting again. Currently letting it charge. Not too hopeful but the alternative is paying Samsung for repairs because its already rooted and the warranty void. First device I've ever had issues with after rooting, funnily enough. Thanks for the help so far.

Deleted, bad information.
Sent from my rooted Galaxy S5.

johnnytraveler said:
Run it till empty (self shut off). Then while the unit is off, see if you can get a full charge. Then download battery calibration from the playstore. It will create a new 100% baseline for your tab.
Sent from my rooted Galaxy S5.
Click to expand...
Click to collapse
NEVER run till empty. Risk permanently damaging the battery.
Links to research found in my guide in previous post. Also many a XDA user issue with failing to power on device after a 100% battery discharge, some requiring a replacement battery. ....
Most of those battery calibration apps do nothing for scaling issues, just reset reporting.
Sent from my SM-N9005 using XDA Premium 4 mobile app

UpInTheAir said:
NEVER run till empty. Risk permanently damaging the battery.
Links to research found in my guide in previous post. Also many a XDA user issue with failing to power on device after a 100% battery discharge, some requiring a replacement battery. ....
Most of those battery calibration apps do nothing for scaling issues, just reset reporting.
Sent from my SM-N9005 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Ok. My bad. Will delete my post.
Sent from my rooted Galaxy S5.

Well, I tried calibrating the battery but clearly, the voltage is too low and that is what is causing the issue. At least, I'm pretty sure that's what it is. I can manage to get it to turn on but it turns off without warning. No shutdown sequence, just dies. Checking the voltage with Battery HD, it fluctuates between 4.2, which I take to be normal and 3.0 which I know is way too low. I've bought an external battery and I'm trying to charge it with that. It may not work but my only other option is sending it to Samsung. I guess as a last ditch effort I could simply disassemble it and reconnect the battery, which I've read often works but I have a feeling this isn't an easy to disassemble device.

Send it back for battery replacement
Sent from my SM-N9005 using XDA Premium 4 mobile app

Well I run all my batteries down until they switch off about once a month to calibrate, and have never had any ill effects. These include my iPad 3, Samsung galaxy s5, Note 2, and now my tab s. Have also done this on my other gadgets that I don't use that often anymore.
This is straight from the Apple website regarding battery care. Scroll to the bottom of the page and read the last section. Yes I know it's Apple, but they all use the same type of batteries. https://www.apple.com/uk/batteries/ipad.html
Sent from my SM-T700 using Tapatalk

simacca said:
Well I run all my batteries down until they switch off about once a month to calibrate, and have never had any ill effects. These include my iPad 3, Samsung galaxy s5, Note 2, and now my tab s. Have also done this on my other gadgets that I don't use that often anymore.
This is straight from the Apple website regarding battery care. Scroll to the bottom of the page and read the last section. Yes I know it's Apple, but they all use the same type of batteries. https://www.apple.com/uk/batteries/ipad.html
Sent from my SM-T700 using Tapatalk
Click to expand...
Click to collapse
I still believe it's bad advice. ....
Many many examples in XDA where users have discharge the battery completely and damaged the battery or the battery falls "asleep" (internal safety circuit opens) with the charger then unable to service the battery. The only solutions were to try charge/wake battery with high current AC charger or battery replacement.
In OP case, appears to be defective battery.
Sent from my SM-N9005 using XDA Premium 4 mobile app

UpInTheAir said:
I still believe it's bad advice. ....
Many many examples in XDA where users have discharge the battery completely and damaged the battery or the battery falls "asleep" (internal safety circuit opens) with the charger then unable to service the battery. The only solutions were to try charge/wake battery with high current AC charger or battery replacement.
In OP case, appears to be defective battery.
Sent from my SM-N9005 using XDA Premium 4 mobile app
Click to expand...
Click to collapse
Just giving people my experiences with battery calibration.
Yes it does seem that the op may have a defective battery.
Sent from my SM-T700 using Tapatalk

Sounds like the OP has an issue with the battery.
Here is some good info on lithium batteries. http://batteryuniversity.com/learn/article/how_to_prolong_lithium_based_batteries
My belief is that you should never run them all the way down.

Deleted.

i'll give this a shot. i really hate to see my tablet going nuts over what's its real battery percentage. crossing my fingers

The battery appears to still work and even hold a small charge. The problem is that the software is telling the battery it is fully charged and is cutting off (my theory). I did a number of battery calibration methods while the battery was at the low voltage. I'm thinking the battery meter now thinks 3.5v or so is a full charge. At 3.5v, it'll say 100 percent, then with some use, it's down to 2 percent (according to the meter) in minutes. I really don't think the battery is dead. Battery University even states that over 90 percent of returned "defective" batteries are perfectly fine and are simply problematic because of other issues. The battery might be dead but I refuse to give up on it. Does anyone know a way to completely reset the battery meter?

monitoring the battery and it's fluctuating, could also be a bad battery but too bad, knox void meter has been tripped. I wont be able to send this to sammy for service/battery replacement. i'll give UpInTheAir's method another shot. else. i'll call it a day and will go to sammy and perhaps, swallow their bnew battery replacement price.

This did it for me! Thanks UpInTheAir. 20 hrs with normal usage and im currently at 52%. I guess a few more charge/discharge cycle and i'd be able to squeeze out the battery's full potential

ThE_SoUrCe said:
This did it for me! Thanks UpInTheAir. 20 hrs with normal usage and im currently at 52%. I guess a few more charge/discharge cycle and i'd be able to squeeze out the battery's full potential
Click to expand...
Click to collapse
Nice to hear a success story. Let's hope the battery stays healthy
Sent from my SM-N9005 using XDA Premium 4 mobile app

Aww. I guess i spoke too soon, battery stats keeps on jumping. Would you advise twrp installation + battery stats wipe? I already lost my warranty when I rooted so i'll do all possible resolutiin first before sending this for battery replacement (might cost an arm and leg though) *sigh*

ThE_SoUrCe said:
Aww. I guess i spoke too soon, battery stats keeps on jumping. Would you advise twrp installation + battery stats wipe? I already lost my warranty when I rooted so i'll do all possible resolutiin first before sending this for battery replacement (might cost an arm and leg though) *sigh*
Click to expand...
Click to collapse
If that doesn't work. ...
I personally would;
1. Download your full firmware package
2. Install TWRP and full backup to external sdcard
3. Format system, data, cache, wipe dalvik cache
4. Boot into DL mode and flash firmware
Sent from my SM-N9005 using XDA Premium 4 mobile app

Nexus 7 goes completely dead at 12% battery.

My N7 has been going completely dead without warning when my battery hits 12%. My battery seems to be in good shape otherwise. I get 6+ hours of usage, and it hasn't taken a whole of of charges in its lifetime. Probably only around 100. I tried everything other than a full factory reset. Calibrated battery. Re-flashed ROM and kernel (ElementalX w/ Rooted Stock) Etc. I'm guessing it is battery/hardware related, but it only started happening after the May 6.01 update. Anyone else having issues or have any suggestions?
Sent from my Nexus 7 using Tapatalk

Something with your ROM is reading the battery percentage wrong. Does this happen with stock ROM
Sent from my Nexus 6 using Tapatalk

Do this:
delete file /data/system/batterystats.bin
let N7 work until it goes dead
fully recharge N7 while it is off
Let us know.

cybertec69 said:
Something with your ROM is reading the battery percentage wrong. Does this happen with stock ROM
Sent from my Nexus 6 using Tapatalk
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Click to collapse
I haven't tried going back to completely stock unrooted. I'm using Bad Boyz Stock Rooted, and never had any issues with it.
Sent from my Nexus 7 using Tapatalk

k23m said:
Do this:
delete file /data/system/batterystats.bin
let N7 work until it goes dead
fully recharge N7 while it is off
Let us know.
Click to expand...
Click to collapse
That was the first thing I tried. :/
I'll try again it again though.
Sent from my Nexus 7 using Tapatalk

just lou said:
That was the first thing I tried. :/
I'll try again it again though.
Sent from my Nexus 7 using Tapatalk
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Click to collapse
FWIW, I tried deleting the batterystats.bin again, and it's no better. The tablet just goes dead between 10 and 15%.
Sent from my HTC6525LVW using Tapatalk

just lou said:
it hasn't taken a whole of of charges in its lifetime. Probably only around 100
Click to expand...
Click to collapse
Let's find out the exact number and other battery stats. Please post 2-min long, complete dmesg log from OS or TWRP, based on ElementalX kernel. Here is more info.
Also, it would be interesting to see logcat at the moment of going dead. Optionally, if you have one of these, measure the battery's capacity (mAh) while off and being charged from dead to full (remember to reset the tester first).
At this stage, considering the normal calibration, I can only speculate that despite 6+hr usage your battery has increased internal resistance which causes rapid loss of (remaining) power.

It certainly sounds like a battery defect or calibration problem, but here's something you might want to try:
Use your device normally until the battery level drops to just above where it would shut off. Then, turn off everything that might drain the battery quickly. Basically, throw it into airplane mode, dim the screen, etc. The idea is to try and slowly ride that puppy past the shut down point to zero and see what the battery level reads while doing it. Does it count down quickly or slowly? Does it still cut off exactly at 12 or at some lower number but was happening too fast for you to see?
If you can get it closer to zero it may cause the calibration to be more accurate.