Eaton 9SX Battery Replacements

Replacement batteries for the Eaton 9SX UPS family

The Eaton 9SX is an online double-conversion UPS line used to protect servers, network gear, and other critical loads. Like every UPS, the 9SX relies on internal sealed lead-acid (SLA) batteries that wear out and need periodic replacement to keep runtime and protection intact. This collection brings together compatible replacement batteries and battery kits for the 9SX range, from the 9SX700 up to the 9SX5KI.

Battery type and how the pack scales

The 9SX uses 12 V sealed lead-acid cells wired in series strings to reach the DC bus voltage each model needs. Smaller units use a handful of cells; larger units use longer strings, which is why a full replacement is sold as a matched kit rather than a single battery. Per-cell capacity is typically rated in amp-hours, and it varies by model across this range, so do not assume one number fits every 9SX. The exact voltage and amp-hour rating for each kit is shown on the individual product page and in the product grid below.

Identify your UPS by exact model

The safest way to order is to match by the exact model number printed on the front bezel or rear label of your unit, for example 9SX1000, 9SX1500, 9SX3000, 9SX3000GL, or 9SX5KI. Suffixes such as G, GL, HW, and similar denote meaningful hardware differences, so confirm the full model string rather than just the VA rating. Select the product that lists your exact model under compatibility, and verify the listed voltage and amp-hours against your existing batteries before ordering.

OEM vs aftermarket

You can replace 9SX batteries with Eaton cartridges or with compatible aftermarket cells that meet the same voltage, capacity, and terminal specification. OEM cartridges arrive pre-assembled in the factory housing. The kits in this collection are compatible replacements matched on voltage, capacity, terminals and connectors.

Battery lifespan

SLA UPS batteries typically last three to five years. Heat is the biggest factor: as a rule of thumb, every roughly 8 C above 25 C can cut useful life in half. Keep the UPS in a cool, ventilated location and test runtime periodically so a tired battery does not surprise you during an outage.

How to replace the batteries

1. Confirm your exact model and order the matching battery or kit.
2. eaton.com lists the 9SX batteries as hot-swappable (internal batteries and EBMs), meaning they can be changed while the UPS continues to power the load. Hot-swapping applies only to these serviceable rack/online units, not to desktop or Back-UPS style units.
3. If your unit is not designed for hot-swap, shut down the protected load and power the UPS off before opening the battery compartment.
4. Remove the old cartridge or cells, noting the wiring orientation, and insert the new ones the same way.
5. Reconnect, close the compartment, and let the UPS recharge fully before relying on it. Recycle the old SLA batteries through an approved program.

Frequently asked questions

How do I know which battery my 9SX needs? Match the exact model number on your unit to a product in this collection, then confirm the voltage and amp-hours shown on that product page.

Are these Eaton batteries? No. The batteries we sell are compatible replacements, matched on voltage, capacity, terminals and connectors; each product page lists its voltage and amp-hours.

Can I replace the batteries without shutting down? Yes: eaton.com lists the 9SX batteries as hot-swappable. If you are unsure, power down first.

How often should I replace them? Plan for every three to five years, sooner in warm environments or after a failed runtime test.

Where do these ship from? Orders ship from Canada.

Model names and trademarks belong to their respective owners. UPSPLUSBATTERY.ca is not affiliated with, endorsed by, or authorized by the manufacturer; aftermarket batteries are compatible replacements.