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Two sealed 12V lead-acid cartridges labelled 21 in a plain box

PowerWarehouse

PowerWarehouse 2XRBC21SLA213 UPS Replacement Battery 2 Pack

SKU CH-1D23-BSH8E

Two 12 V lead-acid batteries replace cartridge 21 in an APC BF500U UPS

  • CompatibilityFits: APC BF500U
  • Compatible with APC BF500U UPS
  • 12V lead-acid cartridge #21 design
  • Two-battery pack for full replacement
  • 100% compatibility guaranteed by manufacturer

Compatible APC BF500U replacement

This two-pack of 12 V lead-acid batteries is built to fit the APC BF500U uninterruptible power supply. Each cartridge carries the model reference 21 and is guaranteed 100 % compatible with the original equipment. The set suits administrators who need a direct swap for depleted cells in that specific UPS. It is not for units requiring a different voltage or cartridge number.

Sealed lead-acid operation

The sealed 12 V chemistry runs without liquid maintenance and vents internally under normal load. Heat output stays low during typical float charging and brief discharge cycles. Acoustic signature is negligible because the cells contain no moving parts. Power draw follows the UPS charging profile rather than imposing its own limit.

Highlights

  • Compatible with APC BF500U UPS
  • 12V lead-acid cartridge #21 design
  • Two-battery pack for full replacement
  • 100% compatibility guaranteed by manufacturer

Specifications

BrandPowerWarehouse
Model2XRBC21SLA213
CompatibilityFits: APC BF500U

Questions about this item

How do I install the two 12 V cartridges in my APC BF500U without reversing the terminals?

Open the BF500U battery door, disconnect the old cartridge #21, insert each new 12 V unit with the red lead to the positive post and black to negative, then close the door and run a self-test.

When should I plan to replace these lead-acid cartridges again?

Expect three to five years of service; schedule replacement when the UPS runtime drops noticeably or the self-test flags a weak battery.

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