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 ...

Under the "APC Smart-UPS Tower" category (the consensus recommendation for price/performance it would seem), there are only 750VA, 1000VA and 2x 1000VA units available.

This helps to eliminate costly battery replacement, labor and service fees and visits over the life of the UPS. The APC Smart-UPS Ultra saves up to 15% on TCO over 10 years and comes with a 5-year ...

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 ...