Database Users

[Q] CM7 battery charging % stuck

Hi guys,
I'd gladly post this on the CM7 RC's thread over at the dev forum but I have yet to accumulate 10 posts.
Lately I've been experiencing weird battery % issues in CM7RC2 and now CM7RC4, that the charging would be stuck at a certain percentage even if I charged it overnight. It never goes to full, until I pulled the battery and rebooted.
Is something wrong with my battery?
Thanks in advanced!

Are you using an official battery or a third-party battery?

I'm using the official one

I'd try charging the battery to full then wiping battery stats from within Clockwork Recovery.

drumist said:
I'd try charging the battery to full then wiping battery stats from within Clockwork Recovery.
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Click to collapse
I would definitely try this.. I had the same problem and it worked for me.. after you reset the stats, drain the battery again till the phone dies, fully charge again, and wipe again
Sent from my Liberty using XDA App

TNPaparazzi said:
I would definitely try this.. I had the same problem and it worked for me.. after you reset the stats, drain the battery again till the phone dies, fully charge again, and wipe again
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Click to collapse
First, doing the battery drain is effective in calibrating the battery meter but is still probably a bad idea because by doing it you are decreasing how much charge the battery can hold (i.e., a full charge will not last as long). It might not be super noticeable, and doing it once in a blue moon is likely not a big deal, but don't do it often or you'll just end up having to replace your battery. Deleting battery stats should be enough to correct the OP's problem, and allowing your phone to recalibrate under normal use is fine but takes longer.
That said, I do the battery drain anyway, but I would definitely suggest not doing it more than once every 6+ months. Wiping battery stats often is not necessary at all, unless of course you are actually having a problem like the OP is.
Second, you definitely should not clear battery stats AFTER performing a battery drain and recharge. The whole point of doing the battery drain is to let the phone gather new information about the battery since you just wiped the battery stats. If you wipe them again after doing that, the battery drain was useless.

"Android System" draining battery

installed EF02... I pull it off the charge around 6:30am...by 11am with casual texting...its down to 20%.. without doing any except moving around screens...it's 8:30am and my battery is at 72%..something is not right...
settings -> about phone -> battery use
shows that my andriod system is at 80%
anyone else have the same stats? hows your battery life?

jackal424 said:
installed EF02... I pull it off the charge around 6:30am...by 11am with casual texting...its down to 20%.. without doing any except moving around screens...it's 8:30am and my battery is at 72%..something is on right...
settings -> about phone -> battery use
shows that my andriod system is at 80%
anyone else have the same stats? hows your battery life?
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Click to collapse
did you calibrate? wipe battery stats?
android system is supposed to take power from the battery... that's what the battery is there for.

algorhythm said:
did you calibrate? wipe battery stats?
android system is supposed to take power from the battery... that's what the battery is there for.
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its not a calibration issue...however I have done that before.
is your phone reading the same?
the android battery stats is reporting that android system's running apps are using 80% of the battery...

jackal424 said:
its not a calibration issue...however I have done that before.
is your phone reading the same?
the android battery stats is reporting that android system's running apps are using 80% of the battery...
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Click to collapse
44%, full bar.

It's a relative statistic. If your screen were on more than it would take up a larger percentage of the power used, "Android System" is just a general name for things that aren't individually covered (display, cell standby etc.) and if the screen is off and you don't have terrible service it makes sense for most of the power to be used by the OS itself.

063_XOBX said:
It's a relative statistic. If your screen were on more than it would take up a larger percentage of the power used, "Android System" is just a general name for things that aren't individually covered (display, cell standby etc.) and if the screen is off and you don't have terrible service it makes sense for most of the power to be used by the OS itself.
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make sense, but my battery drain is just ridiculous...wasn't this bad on froyo..

jackal424 said:
make sense, but my battery drain is just ridiculous...wasn't this bad on froyo..
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Click to collapse
It's not an official release, don't expect it to be perfect. It's perfectly normal for bugs to come up in leaks.

yay a problem I don't have..
I pulled my phone off the charter at 9am, just checked it at 11am and still 100% battery LOL.. I haven't touched it, but doing the same on froyo would have dropped the battery to around 80% by this time regardless.
what services are you running? I've found that trillian is an awful battery hog for example, so I keep it closed unless I actually need it.

It's a reporting issue. Not sure if it's epic or GB but display is NOT right. You can have display on all the time and it will still be 3%. My guess is display reports as android system.

I think reason it drains so fast is that there is a bunch of diagnostic programs which are running. (I think they run these programs in test builds to check for problems). If you select Android System you'll see a list of them. I had the same problem with my battery draining really quickly (went back to EC05).

I've been having issues sometimes where my phone stays awake all the time even with the screen off seemingly nothing running. It wouldn't go back to normal without a reboot.
I just reflashed the EF02 modem yesterday and have not had the problem reoccur yet.
Sent from my SPH-D700 using XDA App

I had horrible battery life my first day and half with the AA i3 rom, because I had kept the EC05 modem (which always performed well for me). Flashed EF02 (and OTAed to EF10) and now get completely ridiculous battery life.

to get the best battery life install setcpu and set it for 200-800 on conservative.. my battery life is much better at that setting

WTF my battery is insane... any ideas?

Ok so I can't figure this out. My battery is kind of "retarded" for lack of a better word.
I can charge it up to 100%, reset battery stats (even if I don't the same will happen)... then let it drain. It will drain insanely fast... I mean from 100 to dead in maybe an hour sometimes...
Then I go ahead and plug it into the charger... for just 15 seconds... when I take it off the charger and turn it back on it'll have another 50% battery life, sometimes more sometimes less....
It's almost as if the battery isn't reading correctly and then the phone can't detect how much battery is left so won't let me turn it on unless I plug it in really quick...
Tried another battery and that one does the same thing.... What in gods name could be going on...
and yes.. I searched... before I hear the hit the search 2000x times.

Here is the instructions from the ExROM thread, they worked perfect for me:
Code:
--> For battery life: I think that you have to calibrate your battery.
- Run the device down until it turns itself off.
- Turn it back on and wait for it to turn itself off again.
- Remove the battery for 10 seconds.
- Replace the battery, but leave the device off.
- Charge the device until full and then for another hour.
- Enter recovery and go to advanced -> wipe battery status. Apply it.
- Run the device’s battery down until it turns itself off.
- Turn the device on and charge for at least 8 hours.
- Unplug the device, turn off, then charge for another hour.
- Unplug the device, turn on, wait 2 minutes.
- Turn off again and charge for another hour.
- Restart and use as normal.

I shall try those but who knows...
I've literally been turning the phone on, it dies the minute it hits the lock screen. Plug it in now for just 3 seconds until it says VIBRANT, it will load up shut down.. have down this about 30 times...
I'm lost on how the phone has enough juice to boot and shi*.... it's driving me nuts doing this over and over and over.. oh wait just turned on again and it's at 5%. This is stupid....
lol i will post back after I try these instructions I guess....

You MUST calibrate your battery every time you see a weird behaviour or install a new kernel. You wrote that you tried another battery, so we can exclude a premature death of the battery.

are you able to get into RECOVERY mode and stay there without it rebooting? Or even Download mode?

yo i dont understand.. didnt a google employee go out and make a public statement that batterystats.bin has NOTHING to do with battery calibration, its only used to keep the data from the settings>battery use graph throughout reboots? In the same statement, i think i remember she told aandroid users NOT to let their batteries die and charge em full cause that will damage the batt.
Sent from a cell tower to the XDA server to you.

I made a nice detailed post about this a while back, it took a google employee for people here to believe.
https://en.wikipedia.org/wiki/Memory_effect
(Keep in mind, this applies to NiCad... but the effects are the same)
Bad news bro, your battery is bad. If you full discharge/recharge all the time, it will just hasten its death. Deep cycle charging when the battery is that far gone doesn't really have the same effect.
Try coaxing it back to life by recharging it to 100% then hitting the charger again at 75% a few times. This will increase the capacitance of the battery if there is hope of life. If it doesn't improve, its life is almost over.

younix258 said:
yo i dont understand.. didnt a google employee go out and make a public statement that batterystats.bin has NOTHING to do with battery calibration, its only used to keep the data from the settings>battery use graph throughout reboots? In the same statement, i think i remember she told aandroid users NOT to let their batteries die and charge em full cause that will damage the batt.
Sent from a cell tower to the XDA server to you.
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Click to collapse
Correct. According to her Calibrating does pretty much nothing except make you THINK your battery is better/worse/same.
Haxel said:
I made a nice detailed post about this a while back, it took a google employee for people here to believe.
https://en.wikipedia.org/wiki/Memory_effect
(Keep in mind, this applies to NiCad... but the effects are the same)
Bad news bro, your battery is bad. If you full discharge/recharge all the time, it will just hasten its death. Deep cycle charging when the battery is that far gone doesn't really have the same effect.
Try coaxing it back to life by recharging it to 100% then hitting the charger again at 75% a few times. This will increase the capacitance of the battery if there is hope of life. If it doesn't improve, its life is almost over.
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Click to collapse
thanks for the interesting read, i love reading things that the mind thinks as something for a weird reason.. Placebo effect etc.
Putting your battery down to an absolute 0% will do nothing but hurt your battery. This would have worked if we were still in the 80s and 90s, but these are Li-on batteries, they work differently and it actually hurts them.

Ok so I have RESTORED the battery...
Here is what was going on after further looking. I downloaded a battery stat/drain program to see what exactly was going on...
Under a load the battery mV will change drastically, then once it settles down the mV will actually rise making the % rise...
So I completely killed the battery, I mean dead.. Restarted the phone, plug it in for just a second.. I took it to the point that I killed the SOB battery.
I then charged it up, and while charging I would use the battery drain program. the mV would change drastically and I did this every 10%.
So far so good, the phone has been on for 4 hours now and i've only drained 8%... I will see how it continues.
I've also been resetting my battery stats not because I believe it relates the phone to the actual battery % but the % would fluctuate on the phone, and I thought the phone was saying "batterys dead don't turn on" kind of thing...

Ok. Again.
Here is a more in-detail article with a quick google.
http://www.atomicmods.com/Categories/QandA-Batteries.aspx
How long will these batteries last?
Lithium-based batteries have a lifetime of 2-3 years. The clock starts ticking as soon as the battery comes off the manufacturing line. The capacity loss manifests itself in increased internal resistance caused by oxidation. Eventually, the cell resistance will reach a point where the pack can no longer deliver the stored energy; although the battery may still contain ample charge. Increasing internal resistance is common to cobalt-based lithium-ion. The speed by which lithium-ion ages is governed by storage temperature and state-of-charge. Figure 1 illustrates the capacity loss as a function of these two parameters.
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Although, there has been arguments for years about Li-ion "memory". Li-ions are not afflicted with the "memory" issues of other chemical types. What they are afflicted with is the inability to hold a consistent current under stress/load with age/oxidation (aging effect of the Li-ion batteries). This is where your battery sits. On the precipice of death. You may get another year or two out of it (if you're lucky.. really more like a few months) with a few correct charging cycles, but that is it.
Bringing a Li-ion to near 0 and back does not help the battery, it is 100% a placebo effect with short term gains at best. A common cause of your particular problem...
Lithium-ion batteries are often exposed to unfavorable temperatures, and these include leaving a cell phone in the hot sun or operating a laptop on the power grid. Elevated temperature and allowing the battery to sit at the maximum charge voltage for expended periods of time explains the shorter than expected battery life. Elevated temperature and excessive overcharge also stresses lead and nickel-based batteries. All batteries must have the ability to relax after charged, even when kept on float or trickle charge.
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Click to collapse
http://batteryuniversity.com/learn/article/how_to_store_batteries
I'm giving random googling as I know it's difficult to believe a random person on the internet. No two type of manufactured batteries are created/engineered the same, but I'm basing my statements of chemical composition and the basic fundamentals of the Li-ion battery tech.

younix258 said:
yo i dont understand.. didnt a google employee go out and make a public statement that batterystats.bin has NOTHING to do with battery calibration, its only used to keep the data from the settings>battery use graph throughout reboots? In the same statement, i think i remember she told aandroid users NOT to let their batteries die and charge em full cause that will damage the batt.
Sent from a cell tower to the XDA server to you.
Click to expand...
Click to collapse
+1
Sent from my SGH-T959 using XDA

Most of these battery calibration techniques sound like a practical joke.
the only way you'll truly get a perfect idea of what your battery life is going to be is to drop the phone in the toilet.
Sent from my SAMSUNG-SGH-T989 using XDA

Odd battery metering issue?

This is curious. It's been this way for about a day or so. No actual battery life issues that I can tell. No heat or performance issues. Battery calibration?
T-mobile rooted and my only mod is AdAway.
Other than this issue, all is normal.
Thoughts?

Vexamus said:
This is curious. It's been this way for about a day or so. No actual battery life issues that I can tell. No heat or performance issues. Battery calibration?
T-mobile rooted and my only mod is AdAway.
Other than this issue, all is normal.
Thoughts?
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Click to collapse
Someone else reported something like this in another topic. I can't remember what type of V20 they had. My thought was that the battery was bad.
Sent from my LG-H910 using Tapatalk

spexwood said:
Someone else reported something like this in another topic. I can't remember what type of V20 they had. My thought was that the battery was bad.
Sent from my LG-H910 using Tapatalk
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Click to collapse
I'm almost 100% certain that it's a calibration issue. 100% software. There were similar issues in a Samsung 6.0.1 ROM as well. Bad battery would be never reporting as "FULL" to the OS. Fortunately, even if it's a bad battery, thank jebus for replaceable battery!
One of the things I'm trying was to pull the battery, hold the power button down to discharge any capacitors in the charging or power circuits and then replaced the battery. Now it shows 89% and charging as well as "collecting battery info... please wait.". I'll let you know if it breaks 94%. I think the calibration was off after going a full day of constant usage but plugged in (drove 10 hours while using Waze).

Definitely a calibration issue. The above method had the predicted effect. Fully charged at 100% again. Spread the word. FYI, I held the power button for a good 30 seconds with no battery in the phone and obviously unplugged.
Peace!

Vexamus said:
I'm almost 100% certain that it's a calibration issue. 100% software. There were similar issues in a Samsung 6.0.1 ROM as well. Bad battery would be never reporting as "FULL" to the OS. Fortunately, even if it's a bad battery, thank jebus for replaceable battery!
One of the things I'm trying was to pull the battery, hold the power button down to discharge any capacitors in the charging or power circuits and then replaced the battery. Now it shows 89% and charging as well as "collecting battery info... please wait.". I'll let you know if it breaks 94%. I think the calibration was off after going a full day of constant usage but plugged in (drove 10 hours while using Waze).
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Click to collapse
Well, you see, at first I thought it was a bad battery, but last night, my battery began acting funny. It was at something like 40% and then I did 1 reboot and then battery was at 25%. Then I had to reboot again, and battery was suddenly at 18% and stayed that way for a long time. I decided to try the calibration thing and it may have solved some of my battery issues (I did a few other things too, so not sure exactly what helped). I was always told that battery calibration was no longer necessary. Something about the way that Android reads the voltage of the phone rather than the capacity now... Or something... I forget the technical mumbo jumbo. Anyways, that's one reason I always had been telling people that calibration is just a placebo and that their battery may just be bad. Now I'm not too sure what to think!
Sent from my LG-H910 using Tapatalk

Battery calibration ?

Do you guys think its necessary to calibrate your battery after a clean install of a ROM. And if so which app do you recommend?

It shouldn't normally be necessary. Some people believe that the early shutdown issue where the phone shuts off at 20% is related to battery calibration but if you don't notice any problems I wouldn't worry about calibrating the battery.

spedyx7 said:
Do you guys think its necessary to calibrate your battery after a clean install of a ROM. And if so which app do you recommend?
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No you can't actually calibrate the battery. All you do is find out the upper limit of charge, monitor discharge rate to tell when 100 and 0 are.

tech_head said:
No you can't actually calibrate the battery. All you do is find out the upper limit of charge, monitor discharge rate to tell when 100 and 0 are.
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One of Google's official fixes for the early shutdown issue is to put the phone in safe mode and let the battery completely drain. That apparently worked for some people and recalibrates the battery so the system actually knows when the battery is depleted.