RE: sprint 2 suggestions?
I run my Sprint 2 on M-Troniks RV15 and a Team Orion Method R 19x2T and it Slides Great...
Nice Punch combined with Reasonable top end for nice 10-15foot slides..( running it on the Stock Gearing too)
As for Battery and Charger...
I run Intellect 3000mah and a Charger similar to a Triton Jr.