i dable a bit in amateur electronics and i was thinking about designing a custom external battery for the psp for long trips. the battery is 3.6v 1200mah and the charger is 5v 2A. Now, designing a 3.6v battery pack (using 3 1.2v 2500mah AA batteries in serial) is pretty easy. I could even go w/ fast rechargables and get like 10 hours of playtime out of a 30 minute charge. The issue i'm having is that i'm not too familiar w/ the psp hardware. it must take 3.6v to run the hardware and i assume the 5v charger allocates 3.6v to run the psp and the remainder goes to charging while playing. if they device isn't on while charging then all 5v are used to quickly charge the battery. now, if a power source different than 5v is plugged into the charger plug, what would be the outcome? i assume that if i removed the PSP battery(to avoid screwing up the charging process and f-ing my battery) and ran 3.6v through the ac adapter plug that it would power the psp.
I know that an external battery pack is possible because i've seen them for sale as part as the bulky hand grip accessory but i'm not sure if they are using 3.6v or 5v.
anyone have any insight?