Dual-Lite EVCH12 784H71 Replacement Battery 12.8V 2000mAh

Dual-Lite EVCH12 — 12.8V LiFePO4 Replacement Battery (784H71)

This is a 12.8V, 2000mAh LiFePO4 replacement battery for the Dual-Lite EVCH12 emergency lighting unit. It fits the EVCH12 fitting directly and restores backup illumination during mains failure. Capacity and voltage match the OEM cell: 12.8V, 2000mAh (25.6Wh).

• EVCH12 fitment: The EVCH12 uses a 12.8V LiFePO4 chemistry cell — not a lead-acid or NiCd pack. Swapping to a different chemistry or voltage will cause the charge controller to misread state-of-charge and trip fault flags on the fitting.
• Bench tested on actual hardware: We cycled this cell through a full discharge-recharge sequence on the EVCH12 charge board. The BMS accepted the cell without fault, float voltage settled at 13.6V, and the charge indicator moved to green within the expected window.
• First test cycle after installation: Within 24 hours of fitting, hold the test button for the full rated duration. This lets the charge controller register the new cell's capacity before the next scheduled compliance test — skipping it risks a failed duration result on the first inspection.

Charge indicator staying red after new battery installation

LiFePO4 cells shipped from storage often rest below the EVCH12 charge controller's float acceptance window. When the controller sees a cell voltage below roughly 12.0V, it flags a fault instead of entering normal charge mode. Leave the fitting on mains power for four to six hours — most units will self-recover once the cell climbs past the acceptance threshold. If the indicator remains red after six hours, check the connector seating and verify cell voltage at the terminals is rising above 12.0V.

Emergency light dims partway through a duration test after replacement

A new cell installed without a prior conditioning cycle may not yet deliver its full rated 2000mAh under load. The EVCH12 draws current at a fixed rate during a test, and an unconditioned cell can sag in voltage before the rated duration is complete, causing the lamp to dim or cut. Run one full manual test cycle immediately after installation to condition the cell. After that cycle, the charge controller will have mapped the cell's actual capacity and subsequent tests should hold brightness through the full duration.