I'm pretty sure Dave's cells are kokams. The 4 cell pack would work in the SS. I think it's 54 bucks with connector. Remember you'll need a Lithium specific charger as well. It's an investment getting into Lipo's-which I feel is worth it. You just have to decide how far you plan to go with the hobby I guess. Dave's a good guy to deal with. Here's a few other links though for more options. I've shopped with all of these businesses and wouldn't hesitate to do so again. I have to stress to you to do a little research on Lipo's. It'll really help when trying to decide what route to go.

http://www.lightflightrc.com/

http://www.b-p-p.com/etecpremade.htm