Vertiv Liebert PowerSure Replacement Batteries

Replacement batteries for Liebert PowerSure UPS systems

The Liebert PowerSure line is a family of UPS units originally sold under Emerson Network Power and now part of the Vertiv portfolio. It spans the PSP off-line, PSA line-interactive (ProActive), and PSI line-interactive (InterActive) series, in mini-tower and rack/tower (RT) chassis. Every unit relies on sealed lead-acid (SLA/VRLA, AGM) batteries that wear out over time and need periodic replacement to keep runtime and protection intact. This collection groups the compatible replacement battery kits we offer for PowerSure models.

Battery type and how packs scale

PowerSure UPS units use maintenance-free sealed lead-acid AGM cells. A single block is most commonly 12V, with capacities such as 7.2Ah or 9.0Ah depending on the chassis; some models instead use 6V blocks (for example a 6V 12Ah cell) and string multiple batteries in series to reach the internal DC bus voltage. Because voltage and amp-hour rating change from model to model, the correct kit is determined by your exact UPS model number, not by a single universal spec. The product grid shows the voltage, amp-hours, and fitment for each kit.

Identify your battery by exact model

Find the model number on the label on the rear or underside of your UPS (for example PS1000RT3-120XRW, PSA650MT-230, or PS3000RT2-120). Match that exact string to the product in this collection. If your label shows a suffix or voltage variant (-120 vs -230, RT2 vs RT3), choose the product that names your exact suffix, since the battery count and capacity can differ between otherwise similar models.

OEM vs aftermarket

OEM kits are sourced through Vertiv and carry the manufacturer's branding. The kits in this collection are compatible replacements matched on voltage, capacity, terminals and connectors. Choose OEM where a warranty or service contract requires it.

Expected lifespan

UPS batteries typically last 3 to 5 years. Heat is the dominant factor: as a rule of thumb, life roughly halves for about every 8°C of sustained operating temperature above 25°C. A unit in a warm closet or rack will need new batteries sooner than one in a cooled room. Plan a proactive swap toward the end of that window rather than waiting for a failed self-test.

Replacement steps

1. Note your exact model number and order the matching kit.
2. The mini-tower PSP and PSA series use a user-replaceable battery compartment accessed by removing a cover plate on the rear or underside; no tools are required. The rack/tower PSI (RT) series are designed for front-accessible battery service.
3. Some PowerSure models support battery replacement while the UPS keeps running on mains (hot-swap), but not all. Confirm hot-swap support in your model's manual before attempting it; if your unit is not rated for hot-swap, shut the UPS down and disconnect it from the wall before opening the battery compartment.
4. Remove the battery cover, disconnect the old pack, and remove it.
5. Insert the new pack, reconnect the leads (observe polarity), refit the cover, and run a UPS self-test.
6. Recycle the old lead-acid batteries at an approved facility.

FAQ

How do I know which kit fits my UPS? Match the exact model number from your UPS label to the product title. The grid lists voltage, amp-hours, and fitment for each kit.

Are these Vertiv batteries? No. The batteries we sell are compatible replacements, matched on voltage, capacity, terminals and connectors.

How long will the new batteries last? Typically 3 to 5 years, less in warm environments since life roughly halves for every ~8°C above 25°C.

Can I replace the batteries while the UPS is running? Some PowerSure models support hot-swap, but not all. Check your model's manual; if it does not state hot-swap support, power the unit down first.

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.