Just when I thought I was at the limit and I'd never be able to hack my [Slim] PSP, Datel comes along and makes a slew of items I can buy to do just that...

But I only need one of these two, so I'll post em

Battery Service Tool



The battery service Tool just turns any of your PSP batteries into a Pandoras Battery and back

MAX Power Tool



and the MAX Power Tool is an already made Pandora's Battery that won't function as anything else (I'm guessing they made a version of that trick where you open the battery up and break one of the connectors on the circuit board)