One of the most important things for your car is the batterypack. It is of no use to have a powerful motor if you feed it with milk.

The batterypack from Suspect is a high quality batterypack at an extremely attractive price.
Improves drive-time and power significantly compared to standard batteries.

Specifications
-7.2v 3300mAh NiMh batterypack
-6 cells (matched +/- max 2%)
-size: 135 x 47 x 25mm (length, width, height)
-silicone wire (12 AWG)
-japan plug (Tamiya connector)
-DeltaPeak 4-5mV/cell
-recommended charging output 1000-3300mA

You can minimize energy loss by changing the plug to Connected plugs.