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 than ...
Editor's Note: March 16, 2026: We've added a section answering some frequently asked questions related to purchasing a UPS backup at the end of this story, which we hope will help you figure out how ...
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