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Rectangular black sealed lead-acid battery cartridge with terminal connectors

PowerWarehouse

PowerWarehouse RBC18-PW laptop battery 4.0" x 11.90" x 1.40" 5.70 lbs

SKU CH-WR9E-RWDE8

Sealed lead-acid replacement cartridge for APC UPS units including PS250, PS450 and SC series, 4.0 by 11.90 by 1.40 inches and 5.70 lbs

  • CompatibilityPS250, PS250I, PS450, PS450I, SC250RM1U, SC250RMI1U, SC450R1
  • Dimension4.0" L x 11.90" W x 1.40" H
  • Weight5.70 lbs
  • Replaces Battery Cartridge #18 for direct fit
  • Compatible with PS250, PS450 and SC series UPS units
  • Sealed lead-acid design prevents leaks during operation
  • Compact 4.0" x 11.90" x 1.40" size fits standard bays
  • 70 lbs weight allows straightforward single-person installation

Replacement UPS battery for APC units

The PowerWarehouse RBC18-PW is a sealed lead-acid cartridge designed to replace the original RBC18 in compatible APC uninterruptible power supplies. It fits PS250, PS250I, PS450, PS450I and several Smart-UPS SC rackmount models listed in the specifications. The unit arrives new and maintenance-free with a leak-proof construction.

Sealed lead-acid thermals and power

As a maintenance-free sealed lead-acid pack the battery generates minimal heat during normal float charging and standby operation. No active cooling is required and the enclosure remains silent in typical office or server-room environments. The 5.70 lb mass sits securely in the UPS chassis without adding vibration or audible noise.

Sustained discharge behaviour

Under extended runtime events the sealed cells deliver steady voltage until the UPS initiates its low-battery shutdown sequence. The leak-proof design prevents electrolyte loss during deep discharge cycles. The cartridge is rated for an 18 month warranty period reflecting expected service life in continuous standby applications.

Highlights

  • Replaces Battery Cartridge #18 for direct fit
  • Compatible with PS250, PS450 and SC series UPS units
  • Sealed lead-acid design prevents leaks during operation
  • Compact 4.0" x 11.90" x 1.40" size fits standard bays
  • 70 lbs weight allows straightforward single-person installation

Specifications

BrandPowerwarehouse
ModelRBC18-PW
Part NumberRBC18-PW
CompatibilityPS250, PS250I, PS450, PS450I, SC250RM1U, SC250RMI1U, SC450R1X542, SC450RM1U, SC450RMI1U
Dimension4.0" L x 11.90" W x 1.40" H
Weight5.70 lbs

Questions about this item

How do I install the RBC18-PW battery in my APC UPS, and what step is often missed?

Power off and unplug the UPS, remove the front cover, disconnect the old battery leads noting polarity, connect the new RBC18-PW leads exactly the same way, refit the cover, then power on and allow the self-test to complete.

What maintenance or replacement will the RBC18-PW need over time?

The sealed lead-acid design is maintenance-free and leak-proof; plan to replace the cartridge after three to five years or when the UPS indicates a battery fault.

What limit appears first when the RBC18-PW runs under sustained load?

Runtime is limited by the 18 Ah capacity; under continuous discharge the voltage will drop until the UPS shuts down to protect the cells.

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