Lumenxl OTG-HH-1 Emergency Light Compatible Battery 3.6V 800mAh

Lumenxl OTG-HH-1 Series — 3.6V Ni-CD Replacement Battery (684315)

This is a 3.6V, 800mAh nickel-cadmium cell for Lumenxl emergency lighting units. It fits the OTG-HH-1, OTG-FF-6, and OTG-VV-5 fittings — all three share the same voltage rail, cell format, and charge controller interface. Dimensions are 49.30 × 28.30 × 26.70mm.

• OTG-HH-1, OTG-FF-6, OTG-VV-5 compatibility: These three fittings run the same 3.6V single-cell Ni-CD charge circuit with identical connector orientation and BMS float voltage. One cell part number covers all three.
• Bench tested on actual hardware: We ran this cell through a full charge cycle on the OTG-HH-1 charge controller. The BMS accepted the cell without fault, reached float charge, and the status LED transitioned from red to green within the expected window.
• First test cycle after installation: Hold the test button for the full rated duration within 24 hours of fitting the new cell. This confirms the cell accepts load under real conditions and lets the charge controller register the new capacity before your next scheduled compliance inspection.

Emergency light failing its duration test after battery replacement

A freshly installed Ni-CD cell does not arrive at full capacity — storage and shipping leave the cell partially discharged. The charge controller in these fittings applies a trickle float charge, which is slow to top up a depleted cell. If a compliance test runs too soon after installation, the cell has not reached rated capacity and the light will cut out before the test duration ends. Allow at least 24 hours on charge before the first test, then run one full manual cycle to condition the cell.

Charge indicator staying red after new cell installation

The charge controller in OTG-series fittings checks cell voltage before accepting a charge cycle. A cell that has sat in a warehouse may read below the float acceptance threshold — typically under 3.0V — which holds the indicator in fault or charging red. Connect mains power and leave the fitting undisturbed for at least 12 hours. If the LED has not shifted to green by then, measure the cell terminal voltage directly; a healthy cell will read above 3.2V under no-load conditions at that point.