It is either shutting off the controller due to high Amps or it is shutting off due to Low Voltage Cutoff (LVC) circuit kicking in. By the size of the battery you mentioned (720mAH) I'd assume it is a AAA NiMH type cell. These can only handle current draw of up to about 5Amps. Above that the voltage will drop off rapidly and your LVC will cut in.
Tell me precisely the battery cell types and the motor model number (there are several variations of speed480). Then I'll run the numbers in Motocalc and tell you what's the problem.
Originally posted by raabid
I'm running a Speed480 direct drive with a folding 6x3. I've tried it with a 8x1700mah set and also a 7X720 mah set, I ran the static motor with both packs and before the TX throttle reaches the top it shuts, off the motor and signals an overload. I don't understand how this can be. The motor specs say it runs at 16 amps,I haven't got a meter I can put on it, but the safety isn't supposed to kick in until twice the rated capacity. I pulled it out of that plane and put it in a Wattage Tangent which was rated for a 15A ESC, and the same thing happened it died around 85% of the throttle. I'm new to electronics and will have a meter soon, but I thought I'd ask just in case I overlooked something simple.