Battery problem, help!!

One day I was playing tekken DR and suddenly the psp turnned off istelf, but the green light (the one that tells you weather the psp is off, on or charging) was still on, soo I remobed the battery and then place it again and the psp re boot, I started to play, and the same thing happened.

Then I tried to charged to see if that was the problem (low battery of smething), but then I realized that it didnt charge a thing, after 3 mins the orange light that tells you that is charging went off. I tried with a friends battery and charger and I ruined his battery :S, dont know how or why, PLS help, TY. And sorry for my bad english

This isn't really a common problem. I'd send it back to sony, Dont think you can fix it. I had a diffrent problem with mine, I had to spend $90 for a replacement. But it was still worth it.