i just had an idea - sorry if what i told you ruined ur battery but i have done it to one of mine before and it worked fine - i think that if you overcharge it it still fills up coz the circuit board isn't on
well anyway seen as we now know that you need a circuit for the battery to charge and discharge properly you said that charging multiple ones didn't work and only charged the first
so my point is what if you hooked all three batteries up to one circuit board and then hooked that circuit board up to the psp - it should then work as it only passes through one circuit board so the psp should read all three as one battery with extremely large capacity - and just take a long time to charge
tell me what you think and maybe try it out
That is exactly what I wanted to do... I'll be putting batteries inside the umd drive slot.... when I get a spare psp I'll be doing this mod