@jaanusa,

It's not always software that drains the battery. I've noticed a couple of times that the battery starts draining (much) faster than usual although nothing heavy is running.

Normally (although it rarely happens) I just turn it off and on again, because I have no time to investigate.

The other day I had that again and, suspecting a WLAN fvck up, did (as root) rmmod wl12xx. The temperature went down and the battery consumption "flattened" again.

From my (little) experience this may happen when you get out of each of a WLAN AP, but that's just a guess..