A:AnswerI've been told you can't do it. I've only had the Grand Max for a couple of weeks. I got it because it was very inexpensive compared to the latest and greatest cell phones. My old BLU 4 would freeze during the boot up so I got a new battery from Ebay. It didn't help So I bought the Grand Max. I'm sure you can try to replace the battery, but with that slide out tray that holds the SIM and the memory card it might be hard to do. I did see two screws at the bottom of the phone. I'd still be scared to try it. Good luck.