I started to build my Jammin X1-CR FTE and just received my Castle Creations Mamba Monster/2200 KV combo from The Barn Floor - they are awesome....... I am waiting for my Castle Creatons X1-CR electric conversion kit. I noticed a guy on ebay selling a conversion kit for the same car.. less parts, but cheaper.....the latter is for a one battery setup. The Castle conversion kit is for a two battery setup. At my level, I don't think it makes a difference.... I will run two 2S batteries...... Most guys suggest 6500 mah for a 15 minute main..... I have no idea what batteries to get.... It will be interesting to see how this older and slightly heavier buggy competes with the latest buggies... I plan on buying a very solid JR servo... still undecided as to which one.... I hope to have more track time with this Jammin than my nitro version...less maintenance and all.....=more fun........