I spoke with Maxamps last week and they are willing to build packs for our needs. I was talking to someone about a 4 cell, 3.7v, saddle parallel pack with 20c cells (I think constant). It was somewhere around 4800 mah at about $50. This was what I was going to try initially. I also plan on buying a serial version of the same pack to test with higher turn BL motors. I want to try this with the Novak 10.5, 17.5 and a 21.5 when it becomes available. I know that the oval guys (BRL, Southwest Tour and Arizona Pan Car Racers) are adopting LiPo for their classes; all are specing the Orion 3200. The word is that the 17.5/3200 combo is equal in speed to the 10.5/4-cell cars and the hope is that the 21.5/3200 will give them the stock equivalent. They also run a mod class using the 10.5(4300)/3200 LiPo combo in open mod against BL and BR 4-cell cars and most of the mod racers in Arizona have switched to this combo. Interesting info as the BL in 1/12 vs. TC are very different and IMO I would think that what the oval guys are figuring out may be more applicable to 1/12 and another alternative to investigate.