An RC battery is a device that stores electrical energy and provides power to the electric motor in an RC vehicle. There are several different types of RC batteries, but the most common are lithium polymer (LiPo) and nickel-metal hydride (NiMH) batteries.

LiPo batteries are a type of rechargeable lithium-ion battery. They have a high energy density, which means that they can store a lot of energy in a small space. They also have a low self-discharge rate, which means that they can hold their charge for a long time. However, they can be dangerous if not handled properly, and they require a specific charger and proper storage.

NiMH batteries, on the other hand, are a type of rechargeable nickel-cadmium battery. They have a lower energy density than LiPo batteries, but they are generally safer and easier to handle. They also have a higher self-discharge rate than LiPo batteries, which means that they will lose their charge more quickly if not used.

Both types of batteries have a specific voltage and capacity, measured in volts and milliampere-hours (mAh) respectively. Voltage indicates the power of the battery, while capacity indicates how long the battery will last before it needs to be recharged.

In summary, an RC battery is a device that stores electrical energy and provides power to the electric motor in an RC vehicle. The most common types of RC batteries are lithium polymer (LiPo) and nickel-metal hydride (NiMH) batteries. They have different characteristics and require different handling, it is important to choose the right battery for your specific RC vehicle and use and store it safely.