$65!! What size? At hobbyking you can get a 2450mah 4s for $25. That torque 2814(same numbers, different order) motor was definately made for 4s because of its slower speed. If this is the extreme flight yak 48" than yes they said 3s or 4s but with that motor you're only going to get serious performance with 4s. If you really want to keep your 3s batteries than i suggest looking at a 1000kv + motor rated at least 500-600 watts. mine is 605w and 1000kv because i didn't want to go up to 4s yet but that'll be when i got more cash lying around. Options-go 4s, get faster motor, larger prop or a combination of the last two or all three(extreme power!!)