I'm quite new here and to Android and that's probably what's causing my difficulty of finding a solution for my problem, so I'm hoping you guys can help me.
So all started a few months ago, when my brother decided to give me his 2 year S2, I was quite satisfied because it's in great condition. After a few months of using it I decided to go on and try some roms dor the sake of my boredom of Samsung's rom and for my will to discover. The rom I tried was Slimkat, it worked pretty good and it's awesome to customize but it was killing ny battery in 8 hours with medium to low use, it was kinda crazy... So I decided to roll back and restore the stock rom, I was successful and it's the one I still have at the moment, but the battery problem remains... I've tried two different batteries and it's always the same and I've run out of solutions that I know.
tl;dr - my battery was fine before I started to play around with roms and after I restored the stock rom the problem remained. The battery itself isn't the problem because I've tried two others.
So I hope you can help me, if you need any other information, I'll be glad to add it.
Regards and thanks in advance