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Two rectangular black battery blocks in a kit

RefurbUPS

RefurbUPS APC RBC18 Replacement Battery Kit (2x 6V9A)

SKU CH-39QD-NC97J

Compatible replacement kit with two 6V9Ah batteries for APC RBC18 UPS models

  • Product typeBattery
  • Product weight8
  • Compatible with APC RBC18 UPS units
  • Kit includes two 6V9A sealed batteries
  • Factory-fresh cells deliver reliable backup power
  • New condition ensures full rated performance

Replacement Kit for APC RBC18 UPS

This kit supplies two 6V9A batteries designed to fit APC RBC18 compatible uninterruptible power supplies. It restores backup runtime for servers, networking gear and workstations that rely on this specific battery form factor. The units arrive factory fresh and ready for immediate installation.

Practical Limits of Lead-Acid UPS Batteries

Lead-acid cells degrade with each deep discharge cycle and lose capacity faster when stored at high temperatures. Runtime will shorten gradually, so plan replacement before the UPS can no longer hold critical loads through an outage. The kit contains exactly two batteries; systems requiring additional cells need a different configuration.

How it compares

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

Price $28.99
Cheaper than about 60% of the 3,915 comparable items (median $39.99).

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Specifications

Product
Product typeBattery

Questions about this item

Should I choose the RBC18 kit or look for a different capacity for my APC UPS?

The RBC18 kit supplies two 6V9A batteries wired to match the original RBC18 specification, so select it when your UPS manual lists RBC18 as the correct replacement.

What runtime can I expect once the two 6V9A batteries are installed in my UPS?

Runtime depends on the UPS model and the connected load; the kit restores the factory voltage and capacity that the UPS firmware expects for its standard runtime calculations.

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