Sony issued a warning to all PSP owners not to use third party battery to power up their PSP. The company urged the use of genuine Sony battery pack to protect against “the danger of ignition and explosion etc.” Sony said while they can guarantee the standards of their battery pack, other brands could cause “accident and breakdown and it is dangerous”.
They also said to be on the look out for fake Sony battery packs, the company cannot be held responsible for any damages cause by these knock-offs and third party battery packs. If you have experienced any kind of damage from using party battery packs Sony is unlikely to repair or replace your PSP.