The battery can be changed back after you are all done. However, you need either a second battery or a second psp (to use to convert the battery back to normal) to run things after you unbrick, as the unbricker battery will not let the psp boot normally. You switch batteries to a normal one to boot the full 1.50. Video of the process, showing when to switch batteries: http://www.youtube.com/watch?v=Rwxq1mJZ2G4 After you have unbricked, you can turn the unbrick battery back into a normal one. But to get through the process you need two, or alternatively a 2nd psp to use to turn the unbrick battery back into a normal one. But if you have a 2nd psp, you probably and a 2nd battery...