You need another psp that has homebrew capabilities, if yours has then it can be downgraded/upgraded without the need of a pandora battery.
Unfortunately, you can use the original one you had, you dont need a spare battery as there are hombrew apps that convert them back again.
You should have bought a premade one from ebay, or find a friend who has a homebrew capable psp.
I have heard rumors that a battery can be created using a pc, but i havent seen this from a reliable source so believe it to be just a rumour and no more.
Kev
