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Rectangular black sealed lead-acid battery with terminal posts

BatteryJack inc.

BatteryJack inc. RBC10 RBC21 PS-1251FP SLA battery HC1217W HC1221W

SKU CH-ZK5A-VBVCZ

Sealed AGM battery replaces RBC10, RBC21, PS-1251FP, HC1217W and HC1221W units with 90% gas recombination and 4-7 year life

  • Advanced AGM technology enables maintenance-free operation
  • Sealed construction prevents electrolyte leakage in any position
  • Gas recombination system recovers over 90% of generated gas
  • 100% OEM replacement fits RBC10, RBC21, PS-1251FP, HC1217W, HC1221W models
  • Expected service life of 4-7 years with three-year warranty on UPS devices

Direct OEM replacement

The PowerStar RBC10 RBC21 PS-1251FP is a sealed lead-acid battery built to replace OEM units in UPS and backup devices. It matches the HC1217W and HC1221W specifications for a 100 percent compatible fit. Advanced AGM technology absorbs electrolyte into glass-mat separators so the battery can operate in any position without leakage. It is classified as non-spillable and meets International Air Transport Association requirements for safe transport.

Maintenance-free sealed design

The sealed construction prevents electrolyte loss from terminals or the case during normal use. Gas recombination technology recovers over 90 percent of generated gas internally, eliminating the need to check specific gravity or add water. Expected service life ranges from four to seven years under floating charge conditions. No routine maintenance is required throughout that period.

Broad device compatibility

This unit serves as a direct replacement for RBC10 and RBC21 cartridge batteries in compatible UPS systems. The three-year warranty covers UPS and backup applications while a two-year warranty applies to other devices. Sealed AGM construction allows flexible mounting orientation inside equipment racks or cabinets. It delivers reliable standby power without the handling restrictions of vented lead-acid alternatives.

How it compares

Measured against everything we stock in Disposable & Rechargeable Batteries, at today’s prices. Recalculated every night.

Price $19.99
Cheaper than about 66% of the 985 comparable items (median $28.99).

Specifications

No published specifications for this item yet.

Questions about this item

How do I install the RBC10 in my UPS and which terminal orientation step is often missed?

Insert the battery with terminals facing the same direction as the original unit; secure the connector firmly and verify polarity before closing the compartment.

What maintenance or replacement will the PS-1251FP need during its 4-7 yr expected life?

The sealed AGM design is maintenance-free; plan a full replacement once capacity drops below useful runtime, typically after 4-7 years of float service.

What limit appears first when the HC1221W runs under sustained load?

Gas recombination handles over 90 % of generated gas, so the first limit is gradual capacity fade from repeated deep discharges rather than venting or dry-out.

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