Sometimes the battery isn't being used to its full extent, or it shows wrong values. This is due to some wrong data stored in a file called
batterystats.bin stored in
/data/system. The steps below will show you how to stretch the battery use and delete the file in CWM (ClockWorkMod) in order to start with a full battery and fresh stats.
- Charge your battery full, bump charge to get the highest level possible ; note that it's not a big deal if it shows 97% when you unplug after bump-charging, more info in this article,
- Drain your battery to 0% until it shuts down by itself (without plugging the charger or connecting the phone to a pc),
- Wait 2 minutes and reboot the phone to ensure the battery is completely flat (it might reboot fully, half way, not at all, don't worry) until it dies again,
- Remove the battery and wait 2 minutes,
- Replace the battery and plug the charger without switching the phone on until it shows 100%,
- When phone shows 100%, boot in recovery (volume up + home + power) and go to > Advanced > Wipe Battery Stats > Confirm (move up/down using the volume keys),
- Reboot the phone and unplug the charger when the "battery full notification" comes (wait for the notification before you unplug the charger!!!!!),
- Now use your phone until the battery is flat again and charge full (no need to have it turned off, unless you it to charge faster). Repeat 2 or 3 times and your battery will be calibrated,
-
Only wipe battery stats once, run a few cycles of full charge / discharge and after that just use your phone as normal (i.e. no need to deplete / charge fully anymore).
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