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Rectangular sealed 6V 12AH AGM battery, grey plastic case with two terminals

BatteryJack inc.

BatteryJack inc. PS-6100 6V 12AH UPS Replacement Battery for APC AP 550ES

SKU CH-159A-MPVRQ

A 6 V, 12 Ah sealed AGM battery that replaces the APC AP 550ES unit (two required)

  • Reliable backup power with 12 Ah capacity
  • Safe operation in any position thanks to sealed construction
  • Zero upkeep required with maintenance-free AGM design
  • Clean, leak-free use from over 90 % gas recombination
  • Direct 100 % OEM fit for APC AP 550ES

Replacement battery for APC AP 550ES

The BatteryJack PS-6100 is a 6V 12AH sealed lead-acid battery built with absorptive glass mat technology. It is sold as a direct OEM replacement for the APC AP 550ES uninterruptible power supply and requires two units per device. The maintenance-free design uses gas recombination to eliminate electrolyte checks and water top-ups.

Suits owners of the matching UPS needing fresh

This battery fits users who must restore backup time on an APC AP 550ES unit and can install a matched pair. It is not for buyers who need a different voltage, capacity, or form factor, nor for systems that accept only a single battery module. Shops looking for hot-swappable cartridges or lithium chemistries should look elsewhere.

Drops into the existing UPS chassis

The sealed, non-spillable construction allows installation in any orientation inside the original battery compartment. No extra cabling, mounting hardware, or ventilation changes are required beyond the standard pair configuration. The AGM design frees the operator from periodic fluid maintenance while meeting air-transport safety classification.

Highlights

  • Reliable backup power with 12 Ah capacity
  • Safe operation in any position thanks to sealed construction
  • Zero upkeep required with maintenance-free AGM design
  • Clean, leak-free use from over 90 % gas recombination
  • Direct 100 % OEM fit for APC AP 550ES

Specifications

No published specifications for this item yet.

Questions about this item

Does the APC AP 550ES need two PS-6100 batteries to operate?

Yes, the APC AP 550ES requires two 6V 12AH batteries connected in series to provide the necessary 12V input for the UPS unit.

Can I mix a new PS-6100 with an older battery still in the UPS?

Mixing a new battery with an aged one is not recommended because differing internal resistance and capacity will cause uneven charging and reduce overall runtime.

How do I verify the PS-6100 set is working after installation?

After installing both batteries, power on the UPS and run a self-test; the unit should report a healthy battery status and support the connected load during a brief power interruption.

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