you turn it off, cause if you leave it on the battery will burn.
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Charge it...
Yes you can, the PSP battery will continue to charge even when you are playing. I would not recommend to do that, it is better if you leave it to charge and then play.
your battery probably died
It's only possible to turn on your PSP with an adapter for the PSP or a battery for the PSP.
Yes, the chargers for each model are the same. It can charge a PSP 2000 or a 3000, etc.