hmm 1st is psp fat battery useable in psp slim?
the 1800mah, 2600mah and 3600mah?
and is psp slim battery usable in psp fat???
hmm why i use my psp fat 2600mah battery on my fren slim the psp cant start?
Can, the slim can use the old PSP's battery. Only disdavantage is that you can't cover the lid.