About this replacement
i kub 212 — 4.8V Ni-MH Replacement Battery (4/HHR-300SC)
This is a 4.8V, 3000mAh Ni-MH replacement battery for the i kub Model 212 emergency lighting unit. It fits the original 4/HHR-300SC cell position and restores the unit's ability to power emergency exit illumination during mains failure. Capacity is 3000mAh (14.4Wh), matching the original specification.
- i kub 212 compatibility: The Model 212 uses a 4-cell Ni-MH pack at 4.8V to match the charge controller's float voltage and thermistor-based charge termination. Swapping to a different voltage or chemistry will cause the controller to misread charge state or overcharge the pack.
- Bench tested on actual hardware: We ran this cell through a full charge cycle and a simulated mains-failure load test. The BMS accepted charge termination correctly and the cell delivered rated capacity at the emergency lighting load current without voltage collapse.
- First-cycle commissioning: After installation, hold the test button for the full rated duration within 24 hours. This lets the charge controller register the new cell's capacity and prevents a false fault reading on your next scheduled compliance test.
Charge indicator staying red after fitting a new 4/HHR-300SC cell
A new Ni-MH cell shipped from storage typically sits at a resting voltage below the charge controller's float acceptance threshold. The i kub 212 controller interprets this as a fault rather than a low cell, so the red indicator stays on even after a confirmed good installation. Leave the unit on mains power for a full 24-hour charge cycle before judging the indicator state. After that cycle, the cell voltage should reach the float window and the indicator should shift to green.
Emergency light dims partway through a duration test after battery replacement
This happens when the replacement cell has not completed a full conditioning charge before the test is run. A partially charged Ni-MH pack starts the test at nominal voltage but sags under sustained load as usable capacity runs short. It is not a cell defect — the cell simply has not reached rated capacity yet. Allow a full 24-hour charge on mains after installation, then repeat the duration test from zero.