Database Develop

Battery stats stay messed up

No matter how many times I calibrate my battery, it lasts for over 30 mins of straight youtube watching with 3g wifi bluetooth and gps on. I know there's no need to calibrate after the stat wiping after charging to 100% but I would like my battery to display correctly. The past two calibrations told me it was off by 8% but it did it twice not only once. So how can I get my battery to display correctly and not last forever sitting at 1%
Sent from my DROID3 using XDA App

Charge to 100% (leave on charger for 4-6 hours) then calibrate (remove batterystats.bin) then deplete battery until phone shuts off by itself, then charge without break to 100%.
Sent from my DROID3 using XDA App

There is no battery calibration. A google engineer has already ended that theory. The batterystats.bin updates everytime the phone is plugged in to charge. Dropping your battery to below 20% before charging is always a wise decision, but you can't calibrate it by deleting file.

ChristianPreachr said:
There is no battery calibration. A google engineer has already ended that theory. The batterystats.bin updates everytime the phone is plugged in to charge. Dropping your battery to below 20% before charging is always a wise decision, but you can't calibrate it by deleting file.
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Click to collapse
I already stated that above but my phone can sit at 1% forever and not die so somethings obviously off
Sent from my DROID3 using XDA App

Obviously it's your battery.
The phone gets the %charge by the voltage. A good battery has a linear drop of voltage during use, but if a cell is defective, it can report a misleading voltage drop curve while still having enough charge to work. IF the battery drops under a determined voltage AND current, it shuts off. While both conditions aren't met, the phone keeps using it until a safe point, where it doesn't damage circuits or the battery itself
Rocking with my M3 and XDA app
Hash's ICS Alpha 7 + Camera fix

problem with battery please help

Hey guys
I have problem with battery
Now my battery 40% when left note sleep up to 3h i back i see battery 41%
I saw it with custom roms and stock i tried all kernels
And problems sometimes appear and sometimes no i tried wipe battery and
No diffrent
I want to destroy this problem for ever
Thanks alot.

No One Know How i can fix it ?

I don't think it's a bug.
I'm pretty sure it's just the way it estimates your battery percentage.
Here's how I think it works.
If you've been using your phone for, say, 3 hours straight, your phone calculates your drain rate like batt%/min or something.
And judging by how long you've used it for, it will estimate the approximate percentage of battery remaining.
When it's on deep sleep for a while, not only is the clock rate different (probably <200mHz at deep sleep), but the drain rate will change too.
The phone will re-estimate the battery percentage according to that new rate, hence the different (often higher) battery percentage, after a period of inactivity.
I could be completely wrong, but that's how I see it.

Thanks for ur Idea Brother

Any one have other Idea ?

I didnt get your problem....
Is your battery draining fast???you mean to say this???
Sent from my GT-N7000 using xda app-developers app

shivg86 said:
I didnt get your problem....
Is your battery draining fast???you mean to say this???
Sent from my GT-N7000 using xda app-developers app
Click to expand...
Click to collapse
Hmmm i mean My Battery sometimes up 1% with itself

Charge your battery overnight n Wipe your battery stats in recovery.
Sent from my GT-N7000 using xda premium

little-vince said:
I don't think it's a bug.
I'm pretty sure it's just the way it estimates your battery percentage.
Here's how I think it works.
If you've been using your phone for, say, 3 hours straight, your phone calculates your drain rate like batt%/min or something.
And judging by how long you've used it for, it will estimate the approximate percentage of battery remaining.
When it's on deep sleep for a while, not only is the clock rate different (probably <200mHz at deep sleep), but the drain rate will change too.
The phone will re-estimate the battery percentage according to that new rate, hence the different (often higher) battery percentage, after a period of inactivity.
I could be completely wrong, but that's how I see it.
Click to expand...
Click to collapse
This might right ... I event experienced ..battery almost empty ..after restart the phone ..1 bar become 2 bars on battery indication ..

Portgas-D-Asce said:
Hmmm i mean My Battery sometimes up 1% with itself
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Click to collapse
If Battery drain is your problem, try this-
Discharge your battery till it switch off automatically
Now connect your charger in switch off mode and charge it till the full.
Now after recharging it fully, unplug your charger from the socket.
Go to recovery mode and go to advance,wipe battery stats and restart your device.
HIT THANKS BUTTON,AS IT IS MANDATORY.

shivg86 said:
If Battery drain is your problem, try this-
Discharge your battery till it switch off automatically
Now connect your charger in switch off mode and charge it till the full.
Now after recharging it fully, unplug your charger from the socket.
Go to recovery mode and go to advance,wipe battery stats and restart your device.
HIT THANKS BUTTON,AS IT IS MANDATORY.
Click to expand...
Click to collapse
Brother my Battery Not Drain its Incrase 1% with itself on deep sleep

Battery is discharging very fast

Hello I have a problem with my 4 month Nexus 7 3G. I noticed that recently the battery drains very fast in standby mode - for example 6-7% per hour. I installed better battery stats to see the deep sleep time and kernel/partial wakelocks... For example the tablet is 1hour and 20 mins in deep sleep and 1 min awake and has gone from 100 to 94 just in hour... Put the the tablet in Airplane mode, did hard reset, reflashed stock rom - no go... Is it possible that my battery has failed? And is it covered by warranty?

kopchev said:
Hello I have a problem with my 4 month Nexus 7 3G. I noticed that recently the battery drains very fast in standby mode - for example 6-7% per hour. I installed better battery stats to see the deep sleep time and kernel/partial wakelocks... For example the tablet is 1hour and 20 mins in deep sleep and 1 min awake and has gone from 100 to 94 just in hour... Put the the tablet in Airplane mode, did hard reset, reflashed stock rom - no go... Is it possible that my battery has failed? And is it covered by warranty?
Click to expand...
Click to collapse
Read the first post in the BBS thread, do it. Post the log to their thread. Perhaps they can come up with something.
First thing I'd try is turning off wifi while it's asleep and see what happens. I've always turned off wifi while my tablets slept and I see about 1% every 6 or so hours, at most.

I factory reseted the tablet, switched the cellular off, the wifi off, turned off sync, didn't install or update any program... I put it in standby mode and after 57 mins it was 5% down. No kernel wakelocks, nothing at all, just deep sleep.

As with any form of problem isolation, you are going to try a few experiments to figure out where the problem is... and where it isn't.
If the problem is the battery itself, it will self-discharge even when the tablet is off and disconnected. (Not only that but the battery might be slightly warm when disconnected, but it might be hard to detect that without an IR Camera).
One experiment to eliminate this possibility is to charge the battery, turn the tablet off, and disconnect the battery overnight. Reconnect the battery, boot the tab, and then examine
the change in battery VOLTAGE, NOT "percent charge" *
You can use something like the app "Current Widget" to read the before/after voltage.
Note that you can't just turn the tablet off in this experiment without disconnecting the battery connector, as there is a possibility the the motherboard has a defect that drains power even when the tablet is off; although if you run this first experiment and find no drop in (unplugged) battery voltage, then doing this ("does the battery voltage fall a lot with the device turned off?") is a useful 2nd experiment.
*The TI BQ72451 battery charge controller IC attempts to gauge battery state by measuring both voltage and cumulative charging/discharging currents (by measuring voltage across a small resistor in the battery terminal path). This means that it is stateful (it has onboard flash memory) and more importantly that the "% charge" value this circuit produces is a computed value, not a measured value. If you are experiencing battery problems, the % charge value should be regarded with some amount of suspicion. For a healthy battery with about a 0.6-0.7v range (say 3.5v-4.2v), a 10% drop in battery capacity will be roughly a drop of about 0.06 volts.
This isn't a solution - but a place to start to eliminate some possibilities.
good luck
PS what does
Code:
$ cat /sys/class/power_supply/battery/health
return? (Should say "Good")

My tablet does the exact same thing. My battery average is 20 hours with use.
Sent from my Nexus 7 using xda premium

It says the battery health is good. I tried everything - reflashed the factory image, even 4.2.1 image, reset to factory defaults, removed the sim, switched off the wifi/nfc/3g... it drains exactly 5%/h in standby and the battery grafic show straight line downwards...The betterbattery stats says the 99% of time the tablet spends deep sleep. I came to the following conclusions: a) the battery has failed, b) the chip (or component) reading the battery stats is faulty c) a hardware defect that drains battery...It's not software since there are no indications that any piece of software is draining the batt.

If you turn the tablet completely off, let it sit for a few hours, and then boot the tablet, does it also lose charge this way as well?
How about if you do the above experiment - but unplug the battery completely instead of simply turning the tab off?
Doubtful this will fix anything, but it will give you more info about where the problem lies.
Along this same line of thinking, I note you have said nothing about voltages. Imagine that the charge controller chip thought that the 100% charge state was a lower voltage than what it should be - this would show up as anomolously large discharge rates (%/hr) even if the current draw was nominal.
I think 100% should be around 4150-4200 mV, and 5% around 3500 mV. (You can use the "Current Widget" app to observe the voltage in a convenient way.)
good luck

bftb0 said:
If you turn the tablet completely off, let it sit for a few hours, and then boot the tablet, does it also lose charge this way as well?
How about if you do the above experiment - but unplug the battery completely instead of simply turning the tab off?
Doubtful this will fix anything, but it will give you more info about where the problem lies.
Along this same line of thinking, I note you have said nothing about voltages. Imagine that the charge controller chip thought that the 100% charge state was a lower voltage than what it should be - this would show up as anomolously large discharge rates (%/hr) even if the current draw was nominal.
I think 100% should be around 4150-4200 mV, and 5% around 3500 mV. (You can use the "Current Widget" app to observe the voltage in a convenient way.)
good luck
Click to expand...
Click to collapse
Hi, I tested the things u mentioned. The n7 charges until it reaches 4200 MV. It doesn't drain battery when powered off. Here are screenshots of usage:

kopchev said:
Hi, I tested the things u mentioned. The n7 charges until it reaches 4200 MV. It doesn't drain battery when powered off. Here are screenshots of usage:
Click to expand...
Click to collapse
Note that the charger chip may not report a "% charge" drop even if the battery is self-discharging with the device off, as no current is detected in the battery lead. Hopefully what you mean by "doesn't drain" is "voltage didn't fall".
Well, I guess you now know that the problem probably is not the battery (although you should still confirm that the almost-discharged voltage is down around 3.5v).
Doesn't solve your troubles though. That 5%/hr drain with the tablet sleeping should be closer to 5% in 12 hours, so your tablet is doing at least 10x worse than it should.
Warranty return to Asus at this point?

Will relock the bootloader and return it to the Asus authorized service in bulgaria.

kopchev said:
Hi, I tested the things u mentioned. The n7 charges until it reaches 4200 MV. It doesn't drain battery when powered off. Here are screenshots of usage:
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Click to collapse
wow, that is something. very nice discharging graph.

A nicer discharging graph...
ando1993 said:
wow, that is something. very nice discharging graph.
Click to expand...
Click to collapse
Here is the graph after I factory reseted the N7 chrged to full and turned off the screen.

I've seen my battery standby performance get worse these last couple of weeks - I used to get between 5-7 days of standby time on a charge, if left unused, but the last few weeks it only goes for 2/3 days now, not sure what's changed...

NFC services were killing mine... Shut NFC off, killed the service, and it's been great for the last few days.

What is the average battery stats for nexus 7 ..
Sent from my Nexus 7 using xda premium

if you go into maps.....settings...location settings...uncheck all options, that seemed to do the trick for me

It's most likely the baseband_xmm_power wakelock, it's a nasty one. It comes and goes when it likes. Google hasn't come out with a fix yet. Reverting to stock doesn't help it. the only fix is to run Franco kernel, he patched it.
.Sent from my Nexus 7 using xda app-developers app

androo45 said:
It's most likely the baseband_xmm_power wakelock, it's a nasty one. It comes and goes when it likes. Google hasn't come out with a fix yet. Reverting to stock doesn't help it. the only fix is to run Franco kernel, he patched it.
.Sent from my Nexus 7 using xda app-developers app
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Click to collapse
Mkernel also has it fixed, same with trinity and dmore kernel and I'm pretty sure faux kernel does as well, as for the stock kernel, it does not have the fix
Sent from my Nexus 7 using xda app-developers app

My battery was being murdered. Eventually I traced it to having Beautiful Widgets on the lock screen. Removed that and battery life is fantastic again. Are others using widgets on the lockscreen?

Try wakelock detector from playstore which will find you your wakelocks...

Weird Battery Problem

CROMiX Beta5
Uh, the battery percentage is always 100% or 98% and never changes unless I completely exhaust the battery.
I notice that the battery voltage does change when I am using or charge it. But it just always shows 100%.
I had tried an app callex battery calibration, and it doesn't work to calibrate the battery.
I wonder the voltage of a healthy and full battery on this device should be 4.3V, but it shows 100% even when the voltage is only at 3.5V:crying:
I tried playing 4K video to exhaust the battery quickly and then recharge it. The charge progress seems normal.
I see a glitch is that when I connect it to the charger, the voltage is 4.2V or higher, but when I plug it, the voltage becomes 4.0V or lower still showing 98% or 100%.
:crying:Anyone can help me?

Are you using that phab7 module? If you are I think that module makes the battery display wonky
Sent from my Note II using XDA Premium 4 mobile app

Battery monitor for charging limits

Hello
I want to know somethings regarding battery on Note 9:
Does Note 9 need the 30%-80% charging limits when used normally (just some phone calls, whatsapp, emails)
If so, what is the app which is best suited for this? I tried battery life extender, but that does not work properly - no alarm rings.
Thank you

tahrang said:
Hello
I want to know somethings regarding battery on Note 9:
Does Note 9 need the 30%-80% charging limits when used normally (just some phone calls, whatsapp, emails)
If so, what is the app which is best suited for this? I tried battery life extender, but that does not work properly - no alarm rings.
Thank you
Click to expand...
Click to collapse
Accubattery Pro should help.
Sent from my SM-N960U1 using Tapatalk

It is better if you leave your device alone while it is charging. As using your device while it is charging can cause additional wear and tear on the device.

That is a myth, using your device while charging has absolutely no impact on battery health.

bigZ said:
That is a myth, using your device while charging has absolutely no impact on battery health.
Click to expand...
Click to collapse
True - simultaneous usage by itself doesn't do anything, as long as you avoid power-intensive tasks such as heavy gaming. Lithium batteries don't like the excess heat, so at least try to keep yours below 50 Celsius or 122 Fahrenheit (cooler is better - this is where the cells start to degrade really fast).

Use battery warner on google play. If your phone is rooted the app will stop charging at a % and recharge again when it hits under a certain %. Great when i have it on charge over time. It will charge the phone back to 100% 30mins +/- before your clock alarm goes off