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Rectangular sealed lead-acid battery cartridge, two 12V 18Ah units, dark casing, integrated handle

CyberPower

CyberPower RBC55-CP 2×12V 18Ah ups replacement battery

SKU CH-3PZN-42KWV MPN RBC55-CP

A user-replaceable cartridge with two 12 V 18 Ah sealed lead-acid batteries restores UPS runtime

  • Product typeBattery
  • DetailsNumber of batteries: 2 Battery size: 12 V/18Ah Battery type:
  • Product dimensions6.8 in × 7.2 in × 5.6 in
  • Product weight58.9 lb (26.7 kg)
  • In the boxBattery Kit and Installation Guide
  • Ready-to-install kit with two 12 V 18 Ah sealed lead-acid cells
  • User-replaceable design lets you swap batteries without tools or downtime
  • Wide 0 – 40 °C operating range keeps UPS running in varied environments
  • Compact 6.8 × 7.2 × 5.6 in footprint fits standard battery compartments
  • Includes installation guide for quick, error-free replacement

Compatible UPS models

Verify the exact CyberPower UPS model that accepts the RBC55-CP cartridge before ordering. The kit contains two sealed lead-acid batteries rated at 12 V and 18 Ah each. Dimensions are 6.8'' x 7.2'' x 5.6'' and the combined weight is 58.9 lbs. Installation is user-replaceable and an instruction guide is included.

Environment and fit

Confirm the UPS bay can accommodate the stated dimensions and weight. Operating temperature range is 32 to 104 °F (0 to 40 °C) and relative humidity tolerance is 0 to 90 %. Ensure the existing battery wiring matches the two-battery series configuration supplied in the kit.

Ideal for planned maintenance

Suits administrators replacing aged cells in a supported CyberPower UPS during scheduled downtime. Not for buyers needing a different voltage, capacity or form factor. Not for units that require hot-swap modules or lithium chemistry.

How it compares

Measured against everything we stock in UPS Replacement Batteries, at today’s prices. Recalculated every night.

Price $351.99
Pricier than about 90% of the 3,915 comparable items (median $39.99).

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Specifications

Product
Brand nameCyberPower
Model nameRBC55-CP
Product typeBattery
Size & build
Product dimensions6.8 in × 7.2 in × 5.6 in
Product weight58.9 lb (26.7 kg)
Shipping weight21.77 kg
Package size457 × 318 × 278 mm
In the box
In the boxBattery Kit and Installation Guide

Questions about this item

Does the RBC55-CP box include everything needed to swap the old cartridge, or do I need extra tools or cables?

The package contains the battery kit and an installation guide. The cartridge is user-replaceable, so no special tools are required beyond basic hand tools.

Should I choose this 12 V 18 Ah two-battery kit or look for a different capacity for my UPS?

This cartridge supplies two 12 V 18 Ah sealed lead-acid batteries wired for the compatible UPS models. Match the voltage and amp-hour rating printed on your existing unit before ordering.

What does the 18 Ah rating actually deliver when the cartridge is installed in a running UPS?

The 18 Ah capacity at 12 V per battery determines how long the UPS can power connected equipment during an outage; actual runtime depends on the load drawn by your devices.

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