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. UPS Battery Replacement: How to Replace It Safely UPS Battery Replacement: When and How to Replace It Yourself Last updated: August 14, 2026 If your UPS no longer keeps your computer running during a power outage, the battery may simply be worn out. A UPS battery replacement can often restore the runtime without replacing the entire UPS. Many home and small-office UPS units use sealed lead-acid batteries, commonly 12V batteries rated at 7Ah or 9Ah. However, battery size and configuration vary by UPS model. Some units use multiple batteries connected together. Replacing a UPS battery can be a straightforward DIY repair, but you need to use the correct replacement battery and follow basic electrical safety precautions. This guide explains when to replace a UPS battery, how to choose the correct replacement, how to install it, and how to test it afterward . . Table of Contents Why Does a UPS Need a Battery? Signs Your UPS Batter...