On several Android forums around the web, Android users have been regularly reporting rapidly draining batteries after flashing custom ROMs (such as Cyanogenmod 7) to their devices. In what follows, we will provide you with a step-by-step solution to said problem.
The battery indicator in the status/notification bar is a reflection of the batterystats.bin file in the data/system/ directory. Every time a custom ROM is flashed on to a device, it is recommended that the battery be software recalibrated or user might experienced an accelerated battery drain.
The accelerated drain is caused by the “off-mark” battery stats file that fools the battery into “thinking” that it has reached the end or peak of its capacity before it is actually fully drained or charged. To remedy said problem,
- Charge your device to 100%. If after a previous attempt to calibrate the battery, your device fails to charge above a fixed level, it is possible that it has been calibrated incorrectly. If so, power it off and plug it in for charging until the LED indicator turns green. If your device does not sport an LED indicator, you’ll have to check the battery level by powering it on.
- Reboot into recovery. If your device is powered off, press the Volume Down and Power buttons together to enter the bootloader and select Recovery to enter system recovery.
- Wipe Battery Stats. The following screenshots demonstrate how to wipe battery stats in ClockworkMod Recovery v2.5.0.7. Select advanced > Wipe Battery Stats > Yes – Wipe Battery Stats.
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