It looks like the replies you have are about voltage boosters,personally i wouldnt have thought you would need this with 4 cells(unless theyre getting knackered).You need a capacitor on your speedo and receiver,they will act as a "resovoir" of power,so when you whack on the throttle and the battery voltage momentarily dips the capacitors maintain the voltage for that small amount of time.Im sure there must be a few threads on oople about "power caps" and their advantages
