[siraloz]

From one of the Stickies:

Originally Posted by manekineko

• Battery level reading and charging generally work, but are a little unreliable. The level will be thrown off severely by heavy power drains such as cellular usage, which causes it to under-report your battery level by a lot, sometimes 30% or more, and it will go back up to normal afterwards. Battery reading is most accurate around 50% and least accurate at the extremes. Charging almost always works, but charging in Android will not top up your battery the last 10% or so you would get in WinMo. Also, uncommonly the phone will be plugged in and show as charging, but actually fail to charge, draining your battery unless you notice it (this can happen even if it was charging fine earlier and you didn't touch it).