Can 4S1P A123 power a Feigao 7XL

[BrianG]

Instead of starving the ESC/motor with batteries that can't put out the juice, I would look at ways to give the buggy more room internally. A simple mod to the body mounting posts can give you 5mm+ more clearance easily. Or, find a buggy body with a more battery-friendly shape. Or, how about centering the motor (using a different mount) over the CD and using dual 2s2p packs in series, one on each side?

Yeah, 1p A123s can supply ~70A, but their voltage does tend to drop quite a bit from graphs I've seen. You'd probably end up with close to the same voltage with a decent high C-rate 3s lipo than 4s1p A123 because of voltage drop (and weight/size will be better). Not to mention runtime on 2.3Ah will be pretty short using A123s.