I'm not sure what you mean by too much power. 11.1 volts will work fine. The milliamps determine runtime. Ironically the Li-Po you picked may not have enough power. That is to say it's 8C rating means it's max continuious amperage is 12 amps. That's borderline for the Axe CP. Also I don't care for Electrifly packs. Especially the 'safecharge' packs. You'll see most of the guys here use Mega Power, Thunder Power, or DN Power Li-po's. They all seem to work well. You'll also want a pack with a balance connector. They last longer.