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Old June 16th, 2012, 11:36 AM   #1 (permalink)
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Default How can I recalibrate battery on non-rooted Prevail?

So I used to have root, and took a few peoples advice and installed all these "battery saving" apps like SetCPU and JuiceDefender and some other battery calibration crap.. All of that junk literally made my battery die 5x faster than normal, and I realized I don't even need root so I factory restored my phone.

Ever since then, my battery meter is all messed up. It will look 30% full, then I will all of a sudden get a little popup "Please plug your phone in, less than 6% battery remaining" or something like that..

I don't have root anymore and don't plan on rooting it again, so is there any way to make my battery meter more accurate?

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Old June 16th, 2012, 11:50 AM   #2 (permalink)
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Default Beware

Battery 'saving' apps can hide malware. Beware.




Top 5 Android malware troublemakers ID'd - Technolog on msnbc.com
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Old June 16th, 2012, 02:50 PM   #3 (permalink)
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So I used to have root, and took a few peoples advice and installed all these "battery saving" apps like SetCPU and JuiceDefender and some other battery calibration crap.. All of that junk literally made my battery die 5x faster than normal, and I realized I don't even need root so I factory restored my phone.

Ever since then, my battery meter is all messed up. It will look 30% full, then I will all of a sudden get a little popup "Please plug your phone in, less than 6% battery remaining" or something like that..

I don't have root anymore and don't plan on rooting it again, so is there any way to make my battery meter more accurate?
you can try charging overnight, leave the battery drain completely, charge overnight again and delete the stats located in /data/system/batterystats.bin
this can be done with or without root privilege.

on a side note; if you only did a factory reset on the phone menu and didn't use odin to flash a stock image then you're still rooted. that option simply wipes your usernames and downloaded apps without changing the system partition.

also, since rooting in itself won't affect your battery life or operation in any way the apps you were using were the real problem and they got deleted when you reset.
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Old June 16th, 2012, 05:43 PM   #4 (permalink)
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You may also want to go in CWM/advanced and clear the battery statistics after you have let the battery drain until it cuts off then charge completely.
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Old June 16th, 2012, 09:48 PM   #5 (permalink)
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you can try charging overnight, leave the battery drain completely, charge overnight again and delete the stats located in /data/system/batterystats.bin
this can be done with or without root privilege.

on a side note; if you only did a factory reset on the phone menu and didn't use odin to flash a stock image then you're still rooted. that option simply wipes your usernames and downloaded apps without changing the system partition.

also, since rooting in itself won't affect your battery life or operation in any way the apps you were using were the real problem and they got deleted when you reset.
I did use Odin to flash a factory image. I will try this though, hopefully it will work. Thanks.
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Old June 16th, 2012, 11:10 PM   #6 (permalink)
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Lithium Ion batteries have no memory. They can not be calibrated. The batterystats.bin is nothing more than info on what's used your battery since your last charge. It doesn't affect your battery life. It doesn't affect your battery percentage reading. It doesn't affect anything to do with your battery. It collects the info that you view under settings/battery usage. It is automatically wiped on it's own each time your phone reaches full charge.
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Old June 17th, 2012, 12:37 AM   #7 (permalink)
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Even though they do not have memory, they still need to be calibrated by running the device until it shuts off then charging it to 100%. Here's a good article on it. They pretty much talk about laptops in this but it also explains "cell mismatching" w/ lithium ion batteries.

What Is Battery Calibration and When Should You Do it?
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Old June 17th, 2012, 01:25 AM   #8 (permalink)
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Battery Calibration – Battery University
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Old June 17th, 2012, 01:36 AM   #9 (permalink)
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LOL, yep..... I read that 1 too.
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Old June 17th, 2012, 02:28 PM   #10 (permalink)
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You may also want to go in CWM/advanced and clear the battery statistics after you have let the battery drain until it cuts off then charge completely.
i think that option just deletes the same file.
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Old July 24th, 2012, 11:40 PM   #11 (permalink)
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You are right. It deletes that file and lets the phone know the batteries capacity before it shows "dead battery". I learned this through upgrading to a larger battery where it wouldn't fully charge until I cleared all the stats 3 times. Lithium Ion Batteries are prone to change and don't know the difference, but they do end up getting in a trend like most things. It sets its course and sticks with it, until otherwise changed.

Happy charging, Boys.
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Old July 28th, 2012, 06:50 AM   #12 (permalink)
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You are right. It deletes that file and lets the phone know the batteries capacity before it shows "dead battery". I learned this through upgrading to a larger battery where it wouldn't fully charge until I cleared all the stats 3 times. Lithium Ion Batteries are prone to change and don't know the difference, but they do end up getting in a trend like most things. It sets its course and sticks with it, until otherwise changed.

Happy charging, Boys.
Did you just clear the battery stats in CWM? If not, what all stats did you clear?
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