I replaced my battery about a month ago. The only thing that bothered me is that I didn't find the PIN code for my PCM 1 until a week later. :P
I also took the opportunity to fix the battery tray, as it looked awful. Check yours when you have the battery out anyway. It's an easy job.
http://986forum.com/forums/diy-project-guides/62720-simple-diy-battery-tray-refurbish.html