@antonisch 3 hours CPU total isn’t the world. That’s not too much… 50% is quite a lot for that.
The other screen-shots you posted don’t look so bad.
It’s weird that the CPU takes up so much within so little time.
Did you upgrade, with clearing the Data?
Check for wakelocks , I don’t have much time to explain so just check this general guide which also deals with wakelocks http://forum.xda-developers.com/android/general/guide-extreme-battery-life-t3095884
BTW 3hours of CPU time under android OS is very high,
Also you can try betterbatterystats to see what’s happening before you do anything.