Yeah, as stated, stay within the voltage and current rating of both the ESC and motor. The capacity becomes an issue of weight. The higher the capacity, the heavier the battery. Just remember that, especially with electrics, weight is critical. Changing anything can effect the weight and the performance.

Watts = voltage X current (amps)

An amp = 1000 milliamps.

Battery rating of 1800 ma is 1.8 amps.

Watts per pound for any level of performance is really the goal. Increase weight changes the watts necessary to fly. Look at the sticky close to the top of the Beginners Forum posting listings.

Remember the performance goals and watts necessary to produce the desired performance. Add weight and the performance goes down.. at times, to the point where the plane won't even fly.

CGr.