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Black rectangular sealed lead-acid battery with two terminals on top

BatteryJack inc.

BatteryJack inc. 12V 9AH UPS Replacement Battery RBC2 APC 300 BK400 BK280 BP280

SKU CH-D454-FZ8NQ

A 12V 9AH sealed AGM battery with T2 terminals fits APC 300, BK400, BK280 and BP280 UPS units

  • Upgraded 9AH capacity extends backup runtime
  • 100% OEM replacement fits APC 300 BK400 BK280 BP280
  • AGM sealed construction prevents leaks in any position
  • Maintenance-free design requires no electrolyte checks
  • 24-month warranty backs long-term reliability

PowerStar 12V 9AH UPS Battery

The PowerStar 12V 9AH sealed lead-acid battery serves as a direct OEM replacement for APC 300, BK400, BK280 and BP280 units. Its AGM construction makes it maintenance-free and classified as non-spillable for safe operation in any orientation. Buyers needing a different voltage or terminal layout cannot use this model.

Sustained Runtime Performance

The 9AH capacity upgrade over the standard 7AH cell extends backup time during prolonged outages. Absorptive Glass Mat separators hold sufficient electrolyte to deliver steady service and the longest life across repeated discharge cycles. Gas recombination handles over 90 percent of generated gas during normal use. Units requiring faster recharge rates or higher surge currents fall outside this design.

Thermals, Noise and Power Draw

Sealed AGM construction eliminates electrolyte leakage from terminals or case, so no cooling airflow or acoustic management is needed. The battery weighs 13.16lbs and measures 5.94in long, 2.56in wide and 3.72in high for direct fitment. A 24-month warranty covers the unit in regular service. Installations demanding active thermal monitoring or liquid cooling are not supported.

Highlights

  • Upgraded 9AH capacity extends backup runtime
  • 100% OEM replacement fits APC 300 BK400 BK280 BP280
  • AGM sealed construction prevents leaks in any position
  • Maintenance-free design requires no electrolyte checks
  • 24-month warranty backs long-term reliability

Specifications

No published specifications for this item yet.

Questions about this item

How much heat does the 12V 9AH AGM battery generate during continuous UPS operation?

The sealed AGM design recombines over 90% of internal gas, so heat output remains low and the unit stays maintenance-free during all-day runtime.

Which terminal type must my UPS have to accept this replacement battery?

The battery uses T2 terminals measuring 5.94in long, 2.56in wide and 3.72in high, matching the APC 300, BK400, BK280 and BP280 models.

Will the 9AH capacity work with the original charger in my older APC BK280 unit?

Yes, the 12V 9AH AGM cell is a 100% OEM replacement for the standard 7AH pack, so the existing charger manages it without modification.

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