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UPS Replacement Batteries and Battery Packs

Replacement battery cartridges, loose sealed batteries and external battery packs for most major UPS models, plus line conditioners. 3,915 products from $5.99 to $4,989.99. RefurbUPS, PowerWarehouse, BatteryJack inc. and more.

3,915 products from $5.99

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Finding the battery that belongs to your UPS

Start with the UPS model number on its label or in the manual, then look for a battery listed as compatible with that exact model. Many makers sell pre-assembled cartridges with codes like RBC and a number, where the cartridge includes the batteries, connectors and wiring. Others sell loose sealed batteries, for example two 12 V 8 Ah units wired together, so compare the voltage, capacity and number of batteries needed.

Capacity in amp-hours and the terminal type must match, since terminals come in different tab sizes and a wrong fit leaves loose connections. Dimensions and weight in the listing help confirm you have the right size. Never mix an old and a new battery in one unit, because the old one drags the new one down. Compatible does not mean identical to the maker's own cartridge, so read the details.

When to swap, and what extra packs and conditioners are for

Sealed lead-acid UPS batteries usually last a few years, and heat shortens that. Replace them when the unit reports a battery fault, when runtime drops sharply, or when the case looks swollen. Many small units allow a swap with the power on, but turn off the load and read the manual first. Old batteries are hazardous waste and should go to a recycler.

External battery packs and rack battery modules add runtime to a matching UPS, and they must be the model the maker names, because voltage and connectors are fixed. Line conditioners and automatic voltage regulators, also listed here, smooth voltage but contain no battery and give no backup. Match their wattage to the load and their voltage to your supply.

Questions about UPS Replacement Batteries and Battery Packs

How do I know my UPS battery needs replacing?
Typical signs are a battery fault light or alarm, failed self-tests, a sharp drop in runtime and a swollen case. Many units also show battery age, so replace on schedule rather than waiting for a failure.
Can I use a higher-capacity battery?
Voltage must match exactly. A higher amp-hour battery may fit and extend runtime but can charge more slowly, and it must physically fit. Follow the maker's guidance for your model.
Is a battery cartridge the same as a loose battery?
A cartridge comes with wiring and mounting built in, so it swaps in with little work. A loose battery needs your old connectors moved over, so check the terminals and wiring before you start.