its not voltage that you need its run time (mah). which is the amount of milli amps the battery will contuninue to put out in one hour. lets say you are running 2 blue P4s. P4s are like 3 volts, and 1000 milli amps. go to like walmart or fred meyer electronic section and you could find some AA NiHM batteries that are 1.2 volt 2500 mah. so put two of those LED in series, resistor the first led from 6 to 3 volts and you have about 1.15 hours of run time. and but also take into consideration as your battery depletes your run time does also. its like a line graph. its level for a bit then slowly starts to decline.
then wiring them in series theres other stuff to consider.
if you wired them in parralel.... HMMMM thinking about this. ask someone elese i dont want to give you false info. im slowly starting to get a hang of this power stuff myself...
people feel free to corect me if im wrong with any of this stuff. just trying to help out,
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