Cars are powered by various sources. Electric models are powered by small but powerful electric motors and rechargeable nickel-cadmium, nickel metal hydride, or lithium polymer cells. There are also brushed or brushless electric motors. Most fuel-powered models use glow plug engines, small internal combustion engines fueled by a special mixture of nitromethane, methanol, and oil (in most cases a blend of castor oil and synthetic oil). These are referred to as 'nitro' cars. Recently, exceptionally large models have been introduced that are powered by small gasoline engines, similar to string trimmer motors, which use a mix of oil and gasoline. Electric cars are generally considered easier for the novice to work with compared to fuel-driven models, but can be equally as complex at the higher budget and skill levels.
If you are building a radio controlled car, you will be faced with choices every step of the way. You will have to decide how to build the model, how to incorporate the radio transmitter, and how you want to paint it. You will also have to decide how you want to power your car. There are several different choices, and unfortunately there isn't one that stands out as better than the rest. Each powering method has its own benefits and tradeoffs that may affect your decision. You will have to consider these benefits compared with what exactly you want to do with your car. Here are the three main ways that you can power a radio controlled car.