An uninterruptible power supply, or UPS, is a device that provides emergency power to a load when the input power fails. A UPS differs from an emergency power supply or standby generator in that it will provide near-instantaneous power by supplying energy stored in batteries, supercapacitors, or flywheels. The on-battery runtime of most UPS units is relatively short, but sufficient to allow information systems to properly shut down or to allow additional time to bring an alternate power source online. The APC UPS Battery Replacement is a battery cartridge that is compatible with select APC UPS models. This battery cartridge is tested and certified for compatibility to restore the performance of your APC UPS to original specifications. When you buy a new genuine APC RBC, you can recycle your old UPS battery via the "RBC Recycling Program" on the APC website. This battery replacement is ideal for use in a home or office. In the event of a power outage, the battery replacement will provide emergency power to your APC UPS, allowing you to properly shut down your information systems or to bring an alternate power source online.