I opened the battery that came with psp in hope to make it a Pandora's battery. Unfortunately, it didn't have the chip mentioned in the hardmodding guides, but a chip labelled "L02 W GS". Battery's model is PSP-110, 3.6V, 1800mAh and it's made in China.
I checked from datasheet that the ground pin of the chip is fourth. Does anyone know if this battery is hardmoddable at all? Should I buy a new spare battery and hope for the best? I wonder if this one had the right chip: http://www.e-ville.hk/product/view/?id=529