Hardware device used to keep a computer or related peripherals on for short periods of time if the power happens to be low or removed. The battery backup allows the computer to shutdown safely or continue to run if the power is off shortly. Large battery backups are commonly used for large corporate networks to safely shutdown servers if power is out for a long period of time or keep the servers running if the power happens to be out for a short period of time. Also see: Battery definitions | 
