UPS Batteries & Replacements

Restore Full Runtime Without Replacing the Whole UPS

UPS batteries and replacement cartridges from APC by Schneider Electric, Eaton, CyberPower, and Vertiv restore full runtime in minutes without replacing the chassis. Swap in a fresh battery cartridge to bring an aging UPS back to peak performance, or add external battery packs to extend backup time for growing server and networking loads. Browse the full UPS and power protection collection for complete UPS systems, PDUs, and surge protectors.

UPS Batteries for Every Deployment

• Scheduled maintenance swaps — replace APC RBC cartridges and Eaton EBP modules on a predictable three-to-five-year cycle to avoid unexpected shutdowns during peak business hours
• Aging battery replacement — restore full capacity when the UPS dashboard reports a replace-battery warning without purchasing an entirely new unit
• Extended runtime builds — add external battery packs from Vertiv, Eaton, and APC to tower and rack-mount UPS systems so critical servers stay online through longer outages
• Emergency spares inventory — keep compatible cartridges on the shelf so your facilities team can react within minutes instead of waiting days on a shipment
• Multi-site fleet standardization — stock a single cartridge model across branch offices and retail locations to simplify procurement and reduce SKU sprawl

Choosing the Right UPS Battery

Selecting the correct replacement battery comes down to matching the exact cartridge number for your UPS model and understanding hot-swap capability. APC uses RBC (Replacement Battery Cartridge) numbers, Eaton uses EBP or compatible pack codes, and CyberPower lists direct-fit part numbers. Always confirm the cartridge number on your existing UPS label or management software before ordering to ensure a drop-in fit. Many modern UPS units support hot-swap battery replacement, meaning you can slide the old cartridge out and insert a new one without powering down connected equipment or interrupting workloads.

Battery Chemistry and Lifespan

Most UPS replacement batteries use sealed lead-acid (SLA) cells, specifically valve-regulated lead-acid (VRLA) in either absorbed glass mat (AGM) or gel configurations. AGM is the dominant chemistry for rack-mount and tower UPS systems because it handles high-discharge events well and recharges efficiently. Sealed lead-acid batteries degrade over time regardless of usage, and high ambient temperatures accelerate the process significantly. Industry best practice is to test or replace batteries every three to five years, even if the UPS has not experienced a significant discharge event. Keeping server rooms at or below 77 degrees Fahrenheit extends battery life noticeably compared to warmer environments.

External Battery Packs and Runtime Expansion

When standard runtime is not enough, external battery packs let you extend backup time without upgrading the UPS itself. Vertiv, Eaton, and APC offer compatible expansion modules that daisy-chain to the main unit and charge automatically through the UPS's built-in charger. Each additional pack typically adds several minutes to several hours of runtime depending on the connected load. Expansion modules are especially cost-effective for growing data closets and edge computing deployments where load creep gradually outpaces the original UPS sizing, scaling protection incrementally as your infrastructure demands increase.

Complete Your Power Infrastructure

• PDUs — metered and switched power distribution for organized rack environments
• Surge Protectors — voltage spike protection for desktops, AV setups, and retail counters
• Rack Mount UPS — battery backup units sized for 19-inch server racks
• Rack Cabinets — server enclosures to house your UPS units and network gear