Hi Don :) there are 2 ways of wiring batteries together, parallel and series, in each case, you want to use batteries that are the same size as far as mah, and c ratings go, so use like a 3 cell 1500mah 20 c rating, with another 1500mah 3 cell 20 c rated, always us the same type battery , always match the batteries, you will be safe doing that, and not cause a fire, now in parallel + to + and - to - lets say you have a 1500 mah lipo 20 c rated 3 cell, hooked in parallel, you will now have a 3000mah lipo 3 cell 20c rated, I dont want to confuse anyone so I am going to stay with Parallel, heads up RC sells a Parallel adapter, dont worry about the extra battery capacity, your motor will just use what it needs from the lipos, as long as it is set up with the right prop, hope that helps, Chellie

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Hi Don, Where have you been?
Paul