My battery is a little over a year old and I was one of the first to do the upgrade to 4.0.4 that had all those early issues. High battery drain in particular. I think that is what really killed mine prematurely. At any rate, I'm still rocking GB and it had been fine, but as of lately my phone was complete junk! I kept getting the task manager popping up. Slow to respond, screen flicker and apps closing, losing signal, you name it. My battery had the buldge. I bought a Samsung direct replacement, same exact battery from Amazon for $15 shipped. Popped it in last night and my phone is back to it's old snappy self. Perfect! So far. I'll keep you all posted, but I now love my phone on GB all over again! So if you have issues, get a new battery!