RE: Wren Super sport and A123's, will it work?
I have spoke with Gaspar specifically about the Wren. His concern with Wren is that the starter they use will require more than 6.6v, as Sara has suggested. The problem with going to a 3 cell is it may be too high for their current kero valve.
So far, the only two engines A123's are known to work well with are the Jet Cat's with a 3 cell (GSU set to 8 cell nicad) and the Jet Central's with a 2 cell. I'm sure we will begin to see more components becomming more A123 friendly.