Put a male end on the MMM then use
http://www.maxamps.com/Deans-Series-Adapter.htm this for a series connection and
http://www.maxamps.com/Deans-Parallel-Adapter.htm this for a parrallel connection. Of course you can make your own with whatever connector you want. I prefer Traxxas connectors myself, MaxAmps only sells a series connector with Traxxas ends, but you can make your own parrallel one.
RC-Monster RC8T 1515 2.5D/MMM/5s RC-M 4500mah
SC10 MMPro 13.5T 2s NeuEnery 5000mah
RC18T Mamba 25/5400kv 2s lipo + 6s NiMh