Do you own a PSP?
Pull the battery out and check if it is swelling. An alarming amount of PSP batteries are beginning to swell and even burst, causing fires.
I learned this and told my friend who has one. He pulled it out, and it was swelling.
Check yours, please.
thinking about this more, pretty sure its been like this for like 12 years. the last time i remember using my psp was for when i modded it to play pokemon yellow, and eventually stopped bc the battery wouldn't stay in place. it has probably looked like this since.