weltall has released a a plugin which will let you to disable / enable the ability of the PSP of charging your battery.

It’s usefull if you don’t want to charge an half charged battery but that you don’t want to completely drain or if you want to switch to and from the power line (for example in car) without making the PSP starting charging the PSP again even if completely charged pratically.

http://forums.qj.net/showthread.php?t=132632