Ok I ordered the Rezound battery a couple of days ago cause apparently it's awesome and the battery seems like the problem, but today I found out something else. When my battery got low to like 15 % or so, I'd plug it in. Well I didn't do that last night and after about an hour or so (when it should have clearly been dead) it was at 2%.
After charging it all night I unplugged it at around 7am and at about 10:30 it was down to 2%. Yeah I know. But I didn't charge it out of curiosity and it stayed at 2% until around 4 30. So I guess it's the phone? It's just misreading the battery level. It quickly drops to 2% like there's a leak and then holds there till it dies. Like I said before I have 2 batteries that I switch out so it has to be the phone. I'm posting this from my phone right now and it has "2%". So I have to just estimate how long it's gonna last.
I did an update in March. Didn't really know what it was for, but could that have done it?
Thanks to any replies and for previous ones.