BG122156813 The 50kmh above is a total lie (unless you maybe throw it off a building?). It will push 21mph (33kmh) with stock setup in the dry. I've managed 23mph with new abec bearings, better greasing, and better shocks.

BG122156813 No, 3S will have too high a voltage and in general are too large. max battery size is 70x38x20mm and 7.4 volts

BG122156813 Spares for HS 18311 (available on this site) work for this car*. There are also metal upgrades available here and on ebay, amazon etc. * except for the shock towers shell mounts. Which are larger on HS 18311. Otherwise. the main chassis, wishbone, steering, gears, tyres, bumpers, etc are all identical.

BG122156813 Look for 7.4v Li-ion 2 cell with T-plug. Size 70mm x 38mm x 20mm (you can go over by a mm or two, but aim for those measurements or less)

BG122156813 Any Li-ion 2 cell, 7.4v with a T plug will do, just be sure to check measurements. (70mm x 20mm x 38mm give or take a couple of mm) higher Mah means longer run time, but more pressure on the car, so use caution. A certain jungle related online retailer has loads of them.