Basically, the Android Software has an idea of how much juice is left in the battery – over time this measurement can become inaccurate and the software may start telling you the battery is running out when it’s actually not.
To alleviate the problem, discharge your battery completely until the phone shuts off and it won’t turn back on, then charge it back up to 100%.
Rooted users, you can go one step further. Once your phone is recharged to 100%, boot into your recovery of choice and hit up the Wipe option, then “clear battery stats.”
Now unplug your phone and use it as normal until it is fully discharged again, then charge it back up. This will give the software a more accurate idea of the capacity of the battery, and your life should increase dramatically.
So.. too keep it clean. For rooted users, to clear your battery stats:
1.) Drain your battery to the point it shuts off on it’s own..
2.) Plug it in & let it charge over night (While it is still off)
3.) Launch into ClockWork Recovery by holding the "VOL UP", "VOL DOWN", & "Power" release those buttons after you see the second Vibrant screen.
4.) Press "reinstall packages" (It should take you to the Clockwork Mod Recovery screen, If it didn’t then press "reinstall packages’ again)
5.) Go to "advanced"
6.) Press "Wipe Battery Stats"
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