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APC RBC18 sealed lead-acid battery cartridge in rectangular plastic housing

APC

APC RBC18 UPS replacement battery

SKU CH-2REE-Y5WST MPN RBC18

Maintenance-free sealed lead-acid cartridge restores runtime to compatible APC UPS units

  • Product typeBattery
  • DetailsBattery Type: Maintenance-free sealed Lead-Acid battery with
  • Product dimensions1.4 in × 11.9 in × 4 in (H × W × D)
  • Product weight5.7 lb (2.59 kg)
  • In the boxAll required connectors, Battery recycling guide, Installati

Model RBC18

  • Maintenance-free design eliminates fluid checks with sealed lead-acid construction
  • 3 to 5 year expected lifespan supports long-term UPS reliability
  • Stand-alone battery stack simplifies installation without rack mounting
  • 70 lbs weight allows easy handling during cartridge replacement
  • All required connectors included for immediate compatibility with supported UPS units

Maintenance-free sealed lead-acid cartridge

This APC RBC18 replacement cartridge restores runtime to compatible UPS units. It uses a maintenance-free sealed lead-acid design with suspended electrolyte that prevents leaks. The cartridge arrives as a stand-alone battery stack with all required connectors and a recycling guide. Expected service life is three to five years under normal conditions.

Suits owners of matching UPS models

It suits administrators who need a direct drop-in replacement for a depleted cartridge numbered 18. Buyers whose UPS requires a different RBC number should look elsewhere because the connector layout and voltage will not match. The package includes reusable packaging and an installation guide for straightforward swaps. No extra tools or firmware steps are required.

RBC Quantity 1 cartridge per pack

Each order delivers exactly one RBC18 cartridge, so systems needing multiple cartridges must order additional units. The physical footprint measures 1.40 by 11.90 by 4.00 inches and weighs 5.70 lbs. Verify the RBC label on your existing unit before purchase to confirm compatibility. Operating environment rating starts at 32 degrees Fahrenheit.

How it compares

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

Price $159.99
Pricier than about 82% of the 3,915 comparable items (median $39.99).

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Specifications

Product
Brand nameAPC
Model nameRBC18
Product typeBattery
Size & build
Product dimensions1.4 in × 11.9 in × 4 in (H × W × D)
Product weight5.7 lb (2.59 kg)
Shipping weight4.08 kg
Package size394 × 211 × 51 mm
In the box
In the boxAll required connectors, Battery recycling guide, Installation guide, Reusable packaging

Other versions of this model

2 more in the same range

Questions about this item

How do I install the RBC18 cartridge and which step is often missed?

Slide the stand-alone battery stack into the UPS bay, then connect the supplied connectors; the step most often missed is attaching the recycling-guide tag to the old unit before removal.

What maintenance or replacement will the RBC18 need during its 3 - 5 year life?

The maintenance-free sealed lead-acid design requires no fluid checks; plan to replace the whole cartridge once capacity drops after the expected service window.

What limit appears first when the UPS runs on the RBC18 during a long outage?

The 5.70 lb sealed lead-acid pack delivers runtime until its suspended-electrolyte cells reach deep-discharge voltage, at which point the UPS shuts down to protect the battery.

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