I couldn't get that principal out of my head either for along time. When it comes to variable loads on the system doing actual work it is absolutely correct. What I wasn't taking into account though was fixed resistance in the various circuits of the receiver, servos and even things like the wiring, connectors and switch. If you apply Ohms law to a 4.8V battery going through a 2 Ohm fixed resistance, you come up with 2.4 Amps. Make that a 6V battery and you end up with 3 amps. (I just made those numbers up because the math was easy)


I run 6V, 2000mAh packs in the majority of my stuff though and it has been plenty.