Odd battery percent shutdown and battery life observations

OK, we all saw people moaning about battery life and the phone shutting down at odd battery levels. I think I have an idea why it is happening but unfortunately no idea how to resolve it.

So with the newest 10.2 leak I used a fair bit of my battery charge and thought I could drain it fully to give it a ful recharge cycle - what you do to recalibrate the control circuit in a laptop if your battery estimations are significantly off.
As a battery drainer I used stereo tube from app world, battery guru does the monitoring.

So what happened? My phone just shut down at 18%...
I rebooted the phone and it had a happy 20% left and ran some more until it sit down at 6% - after which I rebooted it and found I have 18% instead... ok...
Let the phone run some more and it ran...
...and hit 0%... and ran. It then shut down again and refused to boot up again.
So that sounds like a dead battery except that it isn't...

I then swapped out the battery for the one I had in the charger bundle and checked it's state - the bundle reported orange - i.e. somewhere between 25 and 75% charge, not solid red or blinking red as one would expect for an empty battery.

During my drain test I further noticed that the battery voltage was somewhat erratic - it dropped to 3.51 Volts, went up to 3.58 down, up down..
I think it shut down at 3.41V.

Now Lithium Ion batteries are never fully empty when they report empty, however they tend to be close to 3V when empty.

So what does this tell us:
The battery life estimation in the phone based on the charge reading has an issue. This is the same issue that will cause the sudden jump in battery charge of you reboot your phone.

As to what can be done to resolve this. I don't know...
I am not sure the standard laptop technique will work.

Posted via CB10

Same happens on the iphone,i can confirm that,not sure why.

Posted via CB10

Originally Posted by DetlevCM

OK, we all saw people moaning about battery life and the phone shutting down at odd battery levels. I think I have an idea why it is happening but unfortunately no idea how to resolve it.

So with the newest 10.2 leak I used a fair bit of my battery charge and thought I could drain it fully to give it a ful recharge cycle - what you do to recalibrate the control circuit in a laptop if your battery estimations are significantly off.
As a battery drainer I used stereo tube from app world, battery guru does the monitoring.

So what happened? My phone just shut down at 18%...
I rebooted the phone and it had a happy 20% left and ran some more until it sit down at 6% - after which I rebooted it and found I have 18% instead... ok...
Let the phone run some more and it ran...
...and hit 0%... and ran. It then shut down again and refused to boot up again.
So that sounds like a dead battery except that it isn't...

I then swapped out the battery for the one I had in the charger bundle and checked it's state - the bundle reported orange - i.e. somewhere between 25 and 75% charge, not solid red or blinking red as one would expect for an empty battery.

During my drain test I further noticed that the battery voltage was somewhat erratic - it dropped to 3.51 Volts, went up to 3.58 down, up down..
I think it shut down at 3.41V.

Now Lithium Ion batteries are never fully empty when they report empty, however they tend to be close to 3V when empty.

So what does this tell us:
The battery life estimation in the phone based on the charge reading has an issue. This is the same issue that will cause the sudden jump in battery charge of you reboot your phone.

As to what can be done to resolve this. I don't know...
I am not sure the standard laptop technique will work.

Posted via CB10

You are right on the money. I think that the issue is actually a bit worse than what you noticed. I think that both the charging circuitry and the OS have issues. I always experience overheating and battery drain issues when switching back and forth between the stock charger and the rapid charger for instance.

Posted via CB10

Originally Posted by dejanh

You are right on the money. I think that the issue is actually a bit worse than what you noticed. I think that both the charging circuitry and the OS have issues. I always experience overheating and battery drain issues when switching back and forth between the stock charger and the rapid charger for instance.

Posted via CB10

On a laptop computer, the OS can control the charging circuit. It would seem strange big this were not the case on the Z10.
I would guess the overheating is a result of the charging circuit not throttling the charging rate correctly.

Posted via CB10

Hello,

Calibration was out as per my observations. I tried the method posted by some fellow crackberry member Manie. Well It does involve getting your battery empty, my phone shut down at 50% or so. So i kept removed battery, sim n memory card and kept it like that for around an hour and half. then i inserted battery sim n memory card and kept power button pressed for two minutes as instructed by Manie. Then i plugged in the charger and it started from 12%. I did full recharge plus 3 hours more after 100% as instructed. And from next day it was working like before. Also Battery life is improved. Thanks for your help.

Originally Posted by Ashish Sanghvi

Hello,

Calibration was out as per my observations. I tried the method posted by some fellow crackberry member Manie. Well It does involve getting your battery empty, my phone shut down at 50% or so. So i kept removed battery, sim n memory card and kept it like that for around an hour and half. then i inserted battery sim n memory card and kept power button pressed for two minutes as instructed by Manie. Then i plugged in the charger and it started from 12%. I did full recharge plus 3 hours more after 100% as instructed. And from next day it was working like before. Also Battery life is improved. Thanks for your help.

I do think the Z10 will operate like a laptop.
I did my best to drain my Z10 fully and then gave it a fully charged battery from the charger bundle - subjectively I think it "drains" the battery slower (i.e. is more in line with expected % readings).

It makes me think - you could you report or link to the method from Manie?

Originally Posted by detlevcm

i do think the z10 will operate like a laptop.
I did my best to drain my z10 fully and then gave it a fully charged battery from the charger bundle - subjectively i think it "drains" the battery slower (i.e. Is more in line with expected % readings).

It makes me think - you could you report or link to the method from manie?

the post by me states exactly what maine suggested we should do. I tried finding the post again but in vain.