you COULD use 2 packs in the sherman but it would be a tight fit. I use the standard 2 pack setup in my Tiger 1 and get 2-3 hour run times from it. I also use 3200 and 3600Ma rated batteries. If you can fit 2 packs into a sherman i dont see why it couldnt be done. I know they supply you with a Y connector to bridge the 2 MF and DMD connectors into one.