Database Develop

Battery Callibration....issue?

I just started noticing this after I installed Liberty48 (it might have been happening before)
After some use of my phone, it goes down to like 80% battery, but when i reboot, its back at 100%.
Then I tried doing this calibration technique even though its for the DX2 (figured it couldn't hurt)
http://www.droidxforums.com/forum/droid-x2-hacks/36498-battery-calibration-new-method.html
...afterwards, i experienced the same problem, battery drains a little bit and goes way up after a reboot.
Is there any fix for this? I don't have a problem SBFing (or FXZ whatever you call it). I have all my stuff backed up in multiple places. Is this a Droid Bionic problem, or a Liberty ROM problem?

One thing about calibration is that you want to run the battery all the way down at least once without powering down and then charge it to 100% without unplugging (but while powered on). This gives it a chance to establish new battery stats- otherwise it can revert to the assumed values and usually throw off your fresh calibration.

MillionManMosh said:
One thing about calibration is that you want to run the battery all the way down at least once without powering down and then charge it to 100% without unplugging (but while powered on). This gives it a chance to establish new battery stats- otherwise it can revert to the assumed values and usually throw off your fresh calibration.
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That's what Wipe battery stats on CWM is for. I did that.

Not exactly... you're just giving it a fresh start to rebuild the battery stats log "wrong", in essence. One full discharge and charge usually gives it enough recorded stats to properly establish the full point- otherwise the phone assumes that about 4100 mV is fully charged, when in fact this is a high-voltage battery and it should be at about 4300.

MillionManMosh said:
Not exactly... you're just giving it a fresh start to rebuild the battery stats log "wrong", in essence. One full discharge and charge usually gives it enough recorded stats to properly establish the full point- otherwise the phone assumes that about 4100 mV is fully charged, when in fact this is a high-voltage battery and it should be at about 4300.
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So I should just charge it, then let it die, then charge it again while its on?

You got it. As long as you don't plug it in or power it down during discharge, and leave it powered on and on the charger all the way to 100%, you should be good after one cycle.

MillionManMosh said:
You got it. As long as you don't plug it in or power it down during discharge, and leave it powered on and on the charger all the way to 100%, you should be good after one cycle.
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Could I use it as normal during the discharge?

Yep, that's fine. It shouldn't impact anything if you use it during the charge cycle as well, as long as you don't do anything (like hotspot) that would drain the battery faster than it was charging.

MillionManMosh said:
Yep, that's fine. It shouldn't impact anything if you use it during the charge cycle as well, as long as you don't do anything (like hotspot) that would drain the battery faster than it was charging.
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This. Last calibration I did, I ran it down via streaming a netflix movie on 4g. Burned it down in a little over 2 hours.

I'm using a HTC sensation with insert coin rom sense 3.5. Sane exact thing is happening to me except the battery is drained after a restart from maybe 40% to down 6% after a reset.
Sent from my HTC Sensation Z710e using XDA App

Similar issue here. New Droid Bionic. Battery went from 40% to 5% within a minute or two while sitting idle.
Hopefully 5% is enough of a discharge to calibrate the battery. I just finished charging it back up fully.

I just completely killed the battery wiped the status and charging now. In the morning I'll do this step and see how well the battery is after tomorrow.
Damn, it used to last me much longer than this, I don't know what happened.
Sent from my HTC Sensation Z710e using XDA App

Alright so I did the Droid x tip as well, it really doesn't have any effect on HTC phones since it just uses the led light to let you know that the battery is charging or full. But I also turned off always on mobile data and it uses less juice that way. I still get Gmail pushing email and twitter with mention updates.
So far, so good. I'm not rebooting mmy phone for a good two days. Afraid the battery meter will jump all around the place again.
Sent from my HTC Sensation Z710e using XDA App

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?
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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
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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:
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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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wow, that is something. very nice discharging graph.

A nicer discharging graph...
ando1993 said:
wow, that is something. very nice discharging graph.
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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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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

Calibration New battery

Hey.
I bought à New battery three days ago. First Day, battery life was really great.
But yesterday and today, not great.
I think I should make à battery calibration but lots of personns aren't agree with the Best method and I can't let my Juice to 0% because it can be responsable of battery life lost (20%).
So anyone can explain to me please ?
Thanks
Sent from my GT-I9070 using xda app-developers app

I think that li-ion battery cannot be calibrated. All that you could do is to ensure that you use it properly for about 3 cycles, meaning good full charge without interuption, and discharge until your phone turns off. (Do not turn the phone on until you connect charger, but it seems like you already know that). This should ensure that your battery is performing as best as it can, and that the phone is displaying battery level correctly, without sudden drops.

Try this
https://play.google.com/store/apps/details?id=com.nema.batterycalibration&hl=ro

Read this: http://batteryuniversity.com/learn/article/battery_calibration

Thanks but the problem is to let the phone discharge completely, can be lead to lost 20% of autonomy people says.
So I don't want to damage my new battery.

Idea is to let your phone shutdown due to no power, not to drain battery completely.
Battery fakes "no more juice" status when it is nearly dry and phone shuts down due to that.
As long as you do not boot it up after it shutdown on its own (it will allow boot with like 1-2% battery even when it said 0% - shutdown) it is all good.
Sent from my SGS Adv. using xda-developers app.

You shouldn't discharge your battery to 0% every time, but some batteries, especially non-original ones, need formatting in first couple charge-discharge cycles. By formatting I mean complete charge to full discharge, usually 3-5 times. Before formatting you can reset battery stats.
After formatting you shouldn't discharge battery under 15% too often. There is no harm in discharging it below that level from time to time (some suppliers even advise doing full cycle once a month).
If you want to maximize every li-ion battery life you shouldn't discharge under 15% and charge over 80-85%, but it is impractical and you won't use this phone after a year or two so don't bother yourself with upper limit.
Sent from my GT-I9070 using xda app-developers app

Odd battery charging behavior?

Just finished my first charging cycle for my Turbo. When I first got the phone it was about 60%, I plugged it in long enough to copy my music on it and then unplugged it until 1%.
I then charged the phone via USB for about 8 hours. When it was about 92% full it just suddenly went to 100%. Is this normal for a first charge? I'm trying to baby my battery since it is non removable and I want this beast to last as long as possible, for as long as possible.
So what happened?

That's fine for the 1st few charges. No need to baby it either lol

Recently, the battery was replaced in my Nexus 4, Android 5.0. All functions work perfectly, and there's a 20% improvement in battery life. However... Let's say I'm charging from 60%. That takes an hour to 100%. As soon as I unplug from the wall, it drops down to 80%.
Strange behavior, huh? And, I don't have battery apps that change things... just a monitor battery function like Gsam. Any ideas? Thanks
Sent from my Nexus 4 using XDA Free mobile app

mike4472 said:
Recently, the battery was replaced in my Nexus 4, Android 5.0. All functions work perfectly, and there's a 20% improvement in battery life. However... Let's say I'm charging from 60%. That takes an hour to 100%. As soon as I unplug from the wall, it drops down to 80%.
Strange behavior, huh? And, I don't have battery apps that change things... just a monitor battery function like Gsam. Any ideas? Thanks
Sent from my Nexus 4 using XDA Free mobile app
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Use Battery Calibration from play store, charge to 100% first then use it, unplug and reboot phone. Drain to 0 and charge with phone off to 100%...
If that does t help then it may be a problem with the battery or phone.