Rechargeable Batteries for UPS

Batteries are a portable, wireless means of storing energy via the use of self-contained chemical cells. They can be for one-time use and discarded, or recharged and reused. In essence, a battery is an energy storage device, but can only store and release electricity as direct current. Direct current is a flat line at a given amplitude (until it declines as it is exhausted), versus alternating current, which is a sinusoidal wave.