Depending on how much power you are going for, I'm running dual parallel 7.4v-8.4v lipos. Can run in series if I modified my pigtail to make it 14.8v-16.5v. I have 18 amp protection in mine so if I did series it would top out around 315 watts on .85 ohm coil or if running in parallel on same coil it would be about 80 watts.