YOO:
lol. can u tell me what a pandora battery actually does lol.
okay im sure mike can tell you in better detail but here goes
the "pandoras battery" or as sony call it the "service battery" runs the psp in service mode so as to access all the areas not usualy accesable in the flash memory of the psp
as its harder to install custom firware on your slim psp ( i think its because of a lot of protection on the current hardware) *(clever sony)*
andway back to the point this alowes you to install the firmware witthout "bricking" your psp, also if you have a phat psp it will "unbrick" it its very easy to make if you have dont a lot of reading up i makeone in about an hour as it was my first time but not i have i can make one in about half the time (cos we shouldnt rush things ;) )
i hope this helped a little