The 20700 battery is a lithium-ion cell that is defined or grouped by its size - 20mm in diameter and 70mm in length. They are slightly bigger in size than an 18650 battery, which makes them a specialized size cell. These batteries commonly have a high discharge and current draw rate while remaining at a low operating temperature, which makes them ideal and desirable for niche markets of high-drain devices and electronics. You can find them being used in different kinds of electric vehicles, scooters or skateboards (including medical mobility scooters), cordless power tools, custom projects and battery packs.