HTC Thunderbolt stock/rezound Battery issues
Hello everyone, I'm new to the forum and it's due to the issues I'm having with my TB's (non-rooted) battery life. Here's a little back story of my issue. For approximately 6 months, the battery life was sufficient for my daily use. I had to charge it every night but that wasn't a problem. After the 6 months, I found that I had to charge it quite more often than usual but I didn't care. Afterwards, my phone wouldn't charge 100% & I had to carry my wall charger all the time on my campus because the battery would just be drained constantly. It wouldn't even charge past 40%! After a few months playing this ridiculous game with my battery, just yesterday (after a year of purchase) I finally bought a new battery, the HTC Rezound stock battery. I only need it to last another 6 months before I can get a new phone.
Here's the issue. Even after getting the Rezound battery, my phone still can't charge 100% (gets to 61% with phone turned off but after turning on, it won't charge up) and it still drains my battery immediately! I don't know what to do anymore. I cut my brightness to approximately 20%, turned off auto-sync, got rid of unnecessary apps, & I'm lost! If the battery isn't an issue, it's the phone, but I don't know what's wrong with the phone. Please help.