Need some battery advise

GD, I have the 2700 1515 and it does put a bit of a strain on the MM. I suppose that the 1512 might go a bit easier.

Just as a point of interest, I did run my 1515 1700kv motor in my Monster GT this weekend, just to play around with. I used a MM running 4S. The gearing was the largest spur that I could get (52T I think) and an 18T pinion with the tranny locked in first gear and 40 series Moab tires. VERY mild gearing. Not fast at all and clocked at around 35mph. Cogging was almost non existent.