Electric RC off road cars can be made using one of four different types of rechargeable batteries: nickel-cadmium, nickel-metal-hydride, lithium-ion, or lithium-polymer. Each of these has benefits and drawbacks for a hobbyist. The nickel-cadmium (NiCd) battery was the original battery in RC off road cars for hobbyists. The cadmium makes it very difficult to dispose of, and it suffers from memory effects (that is, over time, it can lose its ability to hold a charge). [...] Read more »