Marco,
It's a movie prop, so it'll be on an off several times, but never fully on for more than a few minutes. Looks like you're right on about the RC batteries. Those seem perfect. They offer several different V's (6V, 7.2V, 9.6V). When looking for the right voltage, do you just make sure that it's enough for the LED with the highest FW supply? So, since these are 3.3V LEDs, a 9.6V would be fine as long as I install the correct resistors to drop the voltage across the LEDs? I see an RC battery at Radioshack that is 9.6V/800mAH, so does this mean that this battery would power my unit (if all LEDs were on, so 310mA) for approx. 2.5 hours (800mAH/310mA)? Thanks again for your help, Marco.
Fennel Rye