6AA1700S Emergency Lighting Replacement Battery 7.2V 2000mAh

Emergency Lighting 6AA1700S — 7.2V Ni-MH Replacement Battery

This is a 7.2V, 2000mAh Ni-MH replacement cell for emergency lighting units using OEM part number 6AA1700S. It fits backup lighting systems that activate on mains failure to illuminate evacuation routes. At 146.20 x 28.70 x 15.50mm, it matches the original form factor for direct installation.

• 6AA1700S cell string compatibility: Emergency lighting units in this category use a six-cell Ni-MH string at 7.2V nominal. The charge controller expects a specific float voltage range — this cell matches that window and accepts the trickle charge rate the fitting delivers without triggering an overcharge fault.
• Bench tested on actual hardware: We cycled this cell through a simulated mains-failure activation and held it at load through a full rated-duration discharge. The BMS accepted the cell without fault, and the charge controller moved from bulk to float charge within the expected timeframe.
• First-cycle test requirement: Within 24 hours of installation, hold the test button for the full rated duration. This lets the charge controller register the new cell's capacity before your next scheduled compliance test — skipping this step can cause a false duration-test failure on the first inspection.

Charge indicator staying red after installing a new 6AA1700S cell

Ni-MH cells lose voltage during storage, and a cell sitting in a warehouse at low state of charge can present below the float acceptance threshold the charge controller checks on startup. If the controller sees a resting voltage outside its acceptance window, it holds the fault or charge-active LED rather than transitioning to green. Leave the fitting powered for 12–24 hours without interruption — most controllers will re-attempt float acceptance once the cell voltage climbs past approximately 8.4V under trickle charge. If the indicator still has not moved to green after 24 hours, check the cell connector seating and confirm no oxidation on the terminal contacts.

Emergency light dims and drops out partway through a duration test

A freshly installed Ni-MH cell that has not completed one full conditioning cycle will not deliver its rated 2000mAh from the start. The fitting draws load current the cell cannot yet sustain at full voltage, so output drops and the unit may cut off before the rated duration is reached. This is not a fault — it is a conditioning gap. Run one complete manual test cycle immediately after installation, then allow a full 24-hour recharge before any compliance inspection. The cell will reach rated capacity after that first full charge-discharge cycle.