[BrianG]

maxxdude: Yeah, I know it's not very practical, but I was just musing really. Something lighter like a couple of 100,000uF caps might make a difference and still be light and relatively small. I don't think it's rubbish really. They will supply a very quick and large amount of current, which is something a battery has a hard time doing. The net effect is a smoother and more steady current drain from the batteries with less voltage drop (as long as the high current is short duration). I guess the only way to verify this is to get one of those current/voltage recording modules and see what the current and voltage drop is with and without the cap(s). At only $13 per cap, I think it's worth a try...