We take cryptocurrency — so the coins you hold can buy real hardware.Pay in crypto, spend it on real hardware. Free insured shipping worldwide over $399. Plain, unbranded boxes, sent from Germany.Free insured shipping over $399. Your rate is locked for 30 minutes once checkout opens.Rate locked 30 minutes. Every item sealed, serial-checked and covered by a 24-month warranty.Sealed, 24-month warranty.

Saved items Sign in
Rectangular sealed AGM battery pack with terminal connectors

BatteryJack inc.

BatteryJack inc. APC RBC21 UPS Replacement Battery

SKU CH-PEW3-M1PX8

A maintenance-free AGM battery with sealed construction and 90% gas recombination, designed as a 100% OEM replacement for APC RBC21 UPS units

  • 100 % OEM-compatible fit ensures drop-in replacement
  • Advanced AGM technology delivers maintenance-free operation
  • Sealed non-spillable construction allows safe use in any orientation
  • Over 90 % gas recombination extends service life
  • Expected 4-7 year lifespan reduces replacement frequency

Direct APC RBC21 Equivalent

This replacement battery matches the APC RBC21 specification exactly. It serves administrators who need a drop-in power cell for compatible uninterruptible power supplies. The unit arrives new and ready for immediate installation. No configuration or additional hardware is required.

Sustained Float-Life Behaviour

Advanced AGM technology supports an expected service life of 4-7 years in continuous float operation. Gas recombination recovers over 90 percent of generated gas during normal use. The sealed, maintenance-free design delivers steady output without electrolyte checks or water top-ups throughout its deployed lifetime.

Sealed Non-Spillable Construction

Absorptive Glass Mat separators lock electrolyte in place, preventing leakage from terminals or case in any orientation. The battery meets IATA non-spillable classification for safe transport. A three-year warranty covers UPS and backup devices while a two-year term applies to other applications.

How it compares

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

Price $19.99
Cheaper than about 73% of the 3,915 comparable items (median $39.99).

New to this? Which coin should you pay with — what to check, what it costs to pay, and what is never asked for.

Specifications

No published specifications for this item yet.

Questions about this item

Does the AGM battery generate noticeable heat or noise during continuous UPS operation?

The sealed AGM design is maintenance-free and recombines over 90 percent of gas, so it runs silently without venting or added heat in normal float service.

What existing UPS hardware is required for this RBC21 replacement to function?

It is a 100 percent OEM equivalent for APC RBC21 packs, so it fits directly into the compatible APC Smart-UPS unit you already own.

Will this replacement battery work reliably in an older APC Smart-UPS that has been in service for several years?

Yes, the AGM technology provides a 4 to 7 year expected life and fits the original RBC21 chassis, restoring runtime to the aging UPS.

More in UPS Replacement Batteries

Similar items