I've been having issues with my phone as of late. It will shut itself off randomly without warning; tell me the battery has 10% life left after it was just 100% full 5-min before, etc. So I pull the battery out to do a soft boot, and the battery is noticably fatter in the middle like its ballooning. Its model BTR6400B @ 1400mAh. Just ordered an extended life battery and hope the new battery solves my issues. I love this phone and have had -0- issues with it until a week or two ago.