I think the OP is asking about the life of a battery that is constantly recharged.
By pure nature, a rechargable battery only lasts so long. Everytime they are charged they lose a bit of their chargng power, meaning a new battery will hold 100% charge while an older battery, will say it is 100% charged but may only have 85% power.
It is good for rechargable batteries to fully die before recharging them. So at least once a month, play your psp until the battery completely dies, then recharge it. The psp's battery charger is set with a chip that lets the charger know it is full, so it stops charging. If you have a realy crappy charger (the ones on ebay for .99) then it most likely does not have the chip that signals the charger to stop charging.
I have seen this happen many times to friends cell phones, where they lost the charger and bought a crappy ebay one.
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