for just bashing around, i equipped my micro with 1850 sanyo AA nimh, futaba mc230, and speed 300 motor. the 6-cell AAs have very long run times, even with the 300 motor. downside is theyre heavier than 2/3 A size cells and this matters when racing. the futaba mc230 is inexpensive. its size is just right for the micro. the reverse is a big plus when running around tight spaces, plus it can be disabled for racing.