Boy has it been awhile since I have done anything with my psp. Um a pandora battery is good to have incase you were to brick the psp. What a pandora battery does is make the psp enter recovery mode so that you can reinstall a certain firmware along with all the flash files needed in order to get the psp up and running again. Those files would be placed on the magic stick. Basically you can do whatever you want once its modded. You have a good firmware (not sure what I have). You can play backup umd's which would be loaded from your memory stick. All your emulators and homebrew will also be on the memory stick as well.