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 lead-acid battery, black plastic casing, recessed terminals, 5.51 by 1.89 by 4.0 inches

BatteryJack inc.

BatteryJack inc. PowerStar 12V 5AH Sealed Lead-Acid Battery for PS1251FP

SKU CH-7ZPG-PSPK0

A sealed lead-acid battery with AGM technology fits the PS1251FP and replaces APC and Belkin UPS units

  • Advanced AGM technology delivers reliable sealed power
  • Maintenance-free design eliminates fluid checks and spills
  • 12 V 5 Ah capacity fits PS1251FP and compatible UPS units
  • Recessed terminals ensure secure drop-in installation
  • Direct OEM replacement for APC, Belkin, CyberPower and CSB models

12 V 5 Ah AGM replacement battery

This sealed lead-acid battery uses advanced AGM technology to deliver 12 volts and 5 amp-hours of capacity. It is designed as a 100 % OEM replacement for the PS1251FP form factor and fits units that require a recessed terminal layout. The maintenance-free construction eliminates the need for fluid checks or top-ups during its service life.

Long-term standby reliability

The AGM chemistry provides a low self-discharge rate so the battery holds charge during extended periods of float service. An expected service life of four to seven years supports multi-year deployments in uninterruptible power supplies and backup devices without frequent swap-outs. The sealed, valve-regulated design prevents electrolyte leakage in any orientation.

PS1251FP form-factor compatibility

Physical dimensions of 5.51 inches long, 1.89 inches wide and 4.0 inches high determine whether this unit fits the target chassis. The recessed terminal arrangement must match the host device's connector spacing for a secure connection. Buyers whose equipment requires a different footprint or terminal style cannot use this battery.

Highlights

  • Advanced AGM technology delivers reliable sealed power
  • Maintenance-free design eliminates fluid checks and spills
  • 12 V 5 Ah capacity fits PS1251FP and compatible UPS units
  • Recessed terminals ensure secure drop-in installation
  • Direct OEM replacement for APC, Belkin, CyberPower and CSB models

Specifications

No published specifications for this item yet.

Questions about this item

Does the 12 V 5 AH AGM battery generate noticeable heat or noise during continuous UPS operation?

The sealed AGM design is maintenance-free and has no moving parts, so it runs silently and produces minimal heat under normal float charging in a UPS.

Which UPS models must I already own for this 5.51" × 1.89" × 4.0" replacement to fit and connect?

It is a direct 100 % OEM replacement for APC Back-UPS Office BF250, BF280, BF350, BF400C, BF500, BK280, RBC10, RBC21 and listed Belkin, CyberPower, CSB and Best Technologies units.

Will the recessed terminals on this 12 V 5 AH pack mate with the existing wiring harness in an older APC BF350?

Yes, the recessed terminal layout matches the original RBC21 specification, so the BF350 harness connects without adapters or modifications.

Also in this aisle

People compared these

Same shelf, same checkout — eight coins and a 30-minute rate lock.