To solve issues about power during long time-lapse sequences, I'd like to provide my A720 with and external battery pack able to "simulate" the official power supply (ACK800 code).
My informations are:
Connector polarity: + inside / - external
First I'd like these data to be confirmed, then I don't know if supply voltage from 2 big Nimh batteries (2.4-2.5V) could be enough to operate properly the camera (the "official" voltage could be the "higher side" of allowed voltage to provide better operation, flash recycle, etc.).