HTC One M7 Strange battery

So, i've recently bought an HTC One M7 and i was concerend that my battery was draining fast. So i searched on the forums the whole day and decided to try some of the suggestions. One of them was to wipe cache/Dalvik, so i went and deleted both. My battery seemed to last me 2-3 days or 1% every 2-3 hours or even more sometimes. Well until the next charge that is, the battery just went back to the fast draining mode. I don't know why at all, and every time i wipe the cache/Dalvik it lasts me long, but when i charge it again it goes back. I'm sick of deleting the cache/Dalvik. Does anybody know why does the battery do this? Oh, and i forgot to tell that i'm running Android Revolution HD 92.0 rom if it matters.