I have an APC Smart-UPS 3000 XL battery backup. In addition to the internal batteries, it has a connector for adding an external battery pack to it. While it's available on Newegg for WAY cheaper ...

My UPS stopped holding a charge years ago, turning into just a surge protector instead of a proper battery backup. I found ...

The battery can be removed by popping out the front panel and unscrewing a cover plate. Included in the APC Smart-UPS 1500 is the APC RBC7 battery, which is a set of two 12V, 18.0AH maintenance ...