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Sealed 6V 12AH AGM battery block for APC UPS

BatteryJack inc.

BatteryJack inc. 6V 12AH UPS Replacement Battery for APC RBC3 520ES BK450

SKU CH-KYQX-G3PG6

6V 12AH sealed AGM battery replaces APC RBC3 units in 520ES and BK450 models with maintenance-free operation

  • AGM technology prevents electrolyte leakage
  • 100% OEM replacement fits APC RBC3 520ES BK450
  • Maintenance-free design requires no water or gravity checks
  • Gas recombination recovers over 90% of generated gas
  • Sealed non-spillable construction meets air transport requirements

6V 12Ah UPS Replacement Battery

This 6-volt 12-ampere-hour sealed lead-acid battery is a direct OEM replacement for APC RBC3, 520ES and BK450 units. It uses absorptive glass mat technology so the electrolyte is fully suspended in glass-fibre separators. The case is sealed and classified non-spillable for safe operation in any orientation. Buyers who need a different voltage or capacity cannot use this model.

Thermals Noise and Power Draw

AGM construction recombines over 90 percent of gas generated during normal float service so no electrolyte loss occurs. The battery is maintenance free with no provision for watering or specific-gravity checks. Expected floating service life is four to seven years depending on ambient temperature and discharge cycles. No active cooling or ventilation is required beyond normal cabinet airflow.

Build Fit and Requirements

The unit fits the existing battery compartment of the listed APC models without modifications. Terminal layout matches the original RBC3 specification so existing cables connect directly. No additional mounting hardware or firmware updates are needed. Installers who require a larger form factor or different terminal type must select an alternative product.

Highlights

  • AGM technology prevents electrolyte leakage
  • 100% OEM replacement fits APC RBC3 520ES BK450
  • Maintenance-free design requires no water or gravity checks
  • Gas recombination recovers over 90% of generated gas
  • Sealed non-spillable construction meets air transport requirements

Specifications

No published specifications for this item yet.

Questions about this item

How do I install this 6V 12AH battery into my APC BK450 UPS and what step is often missed?

Disconnect the UPS from mains power, open the battery compartment, unplug the old battery leads, connect the new battery matching red to positive and black to negative, then secure the cover before restoring power.

What maintenance or replacement will this AGM battery need during its 4-7 year expected life?

The sealed AGM design is maintenance-free with no water checks required; plan to replace the battery once it reaches the end of its 4-7 year service life.

What limit appears first when this battery runs under sustained load in a 520ES unit?

The 12 amp-hour capacity determines runtime; under continuous discharge the voltage will drop until the UPS low-voltage cutoff activates and shuts down the output.

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