The APC Back-ups 200 Battery Backup, compatible with the APC brand and specifically designed for the APC model RBC21, is a 12V sealed battery with a capacity of 5ah. This black battery from PowerStar is a reliable power protection solution for your computer or networking equipment, ensuring uninterrupted operation during power outages or surges. With a recessed connector design, this unit from China is a dependable choice for keeping your devices up and running smoothly.