I charged my phone all yesterday evening (probably around 5-6 hours). So the battery was 100%.
5 minutes later I cheched my phone: 31% battery
1 minute later: 9% battery
It stayed on 9% a while, and descended from 9 in the normal way. Ran out of battery this morning, and the phone shut down.
Before I put the phone in the charger yesterday evening , it was at 9%. So it seems that it thinks that it charged, but no current was add to the battery. So when i pull it out from the charger, it thinks that the battery is 100%, but is only in fact 9%.
Maybe my battery is failing. Never had this problem before.
The phone is ON now, and in the charger. Will update post.
Charging by USB from computer.
EDIT1: about the ROM: Really nice! Like it very much! Fast and somewhat stable :P
Phone was charged 91% a couple of hours ago, disconnected the phone. Its still on 91%, so I think the problem is gone... Probably a user error the first time
EDIT3: After charging the phone to 91% (as mentioned before), it stayed on 91% for an abnormal long time. I rebooted the phone, and after the reboot, I had 96% battery...