A battery has the capacity to store energy in a reversible chemical reaction which is stored for times of either low or poor reproduction of energy. Most batteries use the same electro-chemical reactions as in a car battery, only that unlike a car battery, these ones are specifically designed for deep cycling, where one battery stores at least tens and hundreds of times more energy than a typical car battery. There are different types of batteries available and it is important to find one that fits yours needs. The most common one however, is the L-16 size. With proper care, these batteries are warranted to last between 5-10 years. Battery capacity is measured in amp-hours and this battery can last up to 8 hours or 100amps when it starts from a fully charged state.