Saw this on Gamestop and was surprised to see this at all after so many year. This is a 3rd party PSP battery (1800mAh version) from China. I heard about this long ago when PSP 1000 was the recent PSP. I was interested for this  as it stick on your psp and become a back up battery when the one in the psp ran out.

Got this for 15 dollars and have to say, it’s 13 dollars too much. The one I got does charge well and will be complete charge in two hours but it get hot when it’s charging. Also, when you fully charge it, you better use it asap as the battery itself will become dead in few days.

The battery itself can recharge your battery in the PSP or use it and will last  an hour and a half. Overall, not worth the price and just buy offical battery.