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Sealed 12V AGM battery, black rectangular case, T1/T2 terminals, 5.94 by 2.56 by 3.66 inches

BatteryJack inc.

BatteryJack inc. WKA12-8F2 12V 9.0Ah UPS replacement battery

SKU CH-HK4B-2MA54

12V 9.0Ah AGM UPS replacement battery with T1/T2 terminals, 100% OEM compatible, maintenance-free sealed design, 5.94 × 2.56 × 3.66 in

  • 12 V 9.0 Ah capacity exceeds common 7.5 Ah packs
  • Advanced AGM design delivers 4–7 year service life
  • Sealed maintenance-free construction prevents electrolyte leakage
  • T1/T2 terminals fit existing UPS wiring directly
  • 100 % OEM-compatible replacement for straightforward swap

Drop-in UPS upgrade

The BatteryJack WKA12-8F2 is a sealed lead-acid battery built as a direct 100% OEM replacement for UPS units. It suits anyone maintaining backup power for servers, network gear or security systems who wants a simple swap without wiring changes.

AGM sealed construction

Advanced AGM technology absorbs electrolyte in glass-mat separators so the case never leaks and the battery can operate in any orientation. T1 and T2 terminal options match existing connectors, while the 5.94 by 2.56 by 3.66 inch footprint fits the same tray as older 7.5 Ah packs.

Maintenance-free reliability

The sealed design eliminates watering or ventilation checks for the 4 to 7 year expected service life. Gas recombination keeps internal pressure low during normal float charging, so the unit runs quietly inside rack enclosures or office cabinets without adding audible fan load.

Highlights

  • 12 V 9.0 Ah capacity exceeds common 7.5 Ah packs
  • Advanced AGM design delivers 4–7 year service life
  • Sealed maintenance-free construction prevents electrolyte leakage
  • T1/T2 terminals fit existing UPS wiring directly
  • 100 % OEM-compatible replacement for straightforward swap

Specifications

No published specifications for this item yet.

Questions about this item

Does the T1/T2 terminal interface limit the 12 V 9.0 Ah capacity in practice?

No, the T1/T2 terminals simply carry the full 12 V 9.0 Ah rating without capping the output.

What are the exact case dimensions needed for this battery to fit in my UPS?

The case measures 5.94 inches long, 2.56 inches wide and 3.66 inches high.

How is this battery installed, and what step do people often miss?

Remove the old unit, connect the T1/T2 terminals matching polarity, then secure the battery; the step often missed is verifying the terminal orientation before tightening.

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