PSP charges battery but won't turn on

[ahameed]

My PSP battery charges up just fine, in fact it can still hold that charge (I used a four-volt led).

But, the PSP won't turn on after I turned the Power switch up.

I tried using two other batteries and they both seemed to work just fine so it's not the PSP.

[Qmark]

did you allow the LED to discharge the battery completely?

[ahameed]

Yes it discharged the battery completely, but when I plug it in the PSP it would recharge fine without starting.

[Qmark]

If other batteries work fine, just assume that particular battery is defective/broken, and replace it.