how to create a pandora battery with a phat psp
I do not take responsibility if your battery messes up!!
1. get your psp battery

2. then open ur psp with something sharp. like a knife.

3. then get it open.

4. this is what it looks like then it is open. and u need a needle to lift the leg.

5. examine your circuit board.

6. then on the circuit board lift this leg with the needle.

7. then close the battery with glue or something and put it in the psp, if it starts by itself then u have a pandora.
How does this work?
The pin that we just lifted was actually the ground pin of the EEPROM. Removing this pin effectively shuts off the EEPROM. When the microcontroller inside the battery tries to read the EEPROM, it will think the EEPROM contains all 1s (in binary). This is because of the pull-up resistors on the data lines. So the microcontroller returns a serial number of 0xFFFFFFFF to the PSP, which then goes into service mode.
p.s. be warned that the battery will stay pandora forever.