When im on ADHOC party on my PS3 and try to charge the psp, the indicator wont show that im charging the PSP but it is charging even if it isnt showing. You should check if that is in your case too. Play until it warns about low battery and goes to sleep mode. Then plug in the charger and play another 5-10 min and see if it turns off. If it doesnt turn off, then the charger is working.