BatteryJack inc. 12V 18Ah UPS Replacement Battery 2 Pack

Direct UPS replacement

This pack supplies two 12 V 18 Ah AGM batteries built as 100 % OEM replacements for the Werker WKA12-18NB and a long list of equivalent part numbers. Advanced AGM chemistry makes them maintenance-free and sealed for safe indoor use. The design targets a four-to-seven-year service life in standby applications. They arrive new and ready to install in compatible UPS units, alarm panels, emergency lighting and mobility devices.

Drop-in fit for existing enclosures

Each block measures 7.13 in long, 3.00 in wide and 6.6 in high, weighing 12.5 lb, so it occupies the same footprint as the original cells. Nut-and-bolt terminals are included, allowing a direct connection to existing wiring without adapters. The sealed construction means no venting provisions are required, freeing installers from adding external gas management. Two units in the pack simplify swapping both batteries in dual-cell UPS trays at once.

Steady output over long discharges

AGM deep-cycle plates deliver consistent voltage through extended backup events rather than only short bursts. The chemistry resists capacity loss during repeated float charging, supporting the rated multi-year lifespan in fire-alarm, security and exit-sign systems. Self-discharge remains low during storage, so spares stay ready for scheduled maintenance windows. The two-year warranty covers the cells in non-UPS roles such as scooters and gate operators.