"I found this store while searching for a battery upgrade for my slim PSP. They listed a 2200mAh battery for an excellent price, and all pictures indicated that it was an official Sony product.

I received the battery yesterday. Again, everything appeared to be Sony branded, using Sony logos and everything. I popped it into my PSP, charged it, and played for about 2 hours. The battery was drained by 50%, which is actually as bad if not worse than the 1200mAh battery that comes with the PSP slim. My wife has an older PSP that shipped with a 1800mAh battery, so we popped both batteries open to see the difference.

The 1800mAh internal battery pack was large, with a circuit board the size of the battery pack attached to the back of it. The new 2200mAh battery pack was no bigger than the 1200mAh one, with foam backing to make it fill space, and a circuit board about 1/4 the size of the other--clearly a fake in all possible ways.

Be wary, be VERY wary when buying from this retailer. Don't EVER buy these batteries that say "Stamina" on them, even if they look authentic in every other way. Since I opened the battery itself, I can't really return it, but for the rest of you, beware."