About this replacement
ESYLUX ELX LED — 3.6V Ni-MH Replacement Battery (EN10077418)
This is a 3.6V, 3000mAh Ni-MH replacement battery for the ESYLUX ELX LED emergency lighting unit. It fits fittings identified by OEM part number EN10077418. Capacity matches the original cell at 10.8Wh.
- ELX LED fitting compatibility: The ELX LED series uses a shared voltage rail and connector format across its standard emergency lighting range. This cell matches the physical dimensions (128.80 × 24.30 × 22.30mm), terminal orientation, and charge voltage the onboard controller expects. No modification needed.
- Bench tested on actual hardware: We ran this cell through a full charge cycle and simulated mains failure. The charge controller accepted the cell without fault, the emergency circuit activated cleanly on mains drop, and the BMS held the load voltage steady across the test duration.
- First-cycle test requirement: Perform a full manual test within 24 hours of installation by holding the test button for the complete rated duration. This lets the charge controller register the new cell and confirms the cell accepts load before your next scheduled compliance test.
Charge indicator staying red after new battery installation
The ELX LED charge controller checks cell voltage before switching to float charge. A new Ni-MH cell that has been in storage often sits below the float acceptance window — typically under 3.4V — so the controller holds in fast-charge mode and keeps the indicator red. This is normal and not a fault. Leave the fitting connected to mains for 12–24 hours. Once the cell reaches the float threshold (around 3.6–3.72V), the indicator will switch to green.
Emergency light dims partway through a duration test
A new cell that hasn't completed its first full charge cycle will show lower available capacity under sustained load. The fitting draws constant current during a test, and an undercharged Ni-MH cell drops voltage faster than rated — the LED output dims as the cell voltage falls. This is a conditioning issue, not a defective cell. Allow a full 24-hour charge after installation, then rerun the test. The cell should hold rated voltage for the full test duration from the second cycle onward.