The venoms are fine. I use them for bashing and racing(just for fun). They come with the white Tamiya type connector. The E-Firestorm's connector is also that style connector. As for a cheap dual battery charger you can use the Dynamite Dual E, but you'll wind up turning the dial twice. I'm not sure about any other dual battery chargers since I never used one. Just my LRP Pulsar. Hope this helps. Feel free to pm me if you have any other questions.

Tim