Elubat Swiss 275 602 Emergency Light Compatible Battery 2.4V

Elubat swiss 275 602 — 2.4V Ni-CD Replacement Battery

This is a 2.4V 2000mAh Ni-CD replacement cell for the Elubat swiss emergency lighting unit, model 275 602 (also listed as 275602). It slots into fittings that power emergency exit signs and backup illumination when mains power is cut. Voltage, capacity, and cell dimensions (86.00 × 26.00 × 22.60mm) match the original specification.

• 275 602 fitting compatibility: Both model references — 275 602 and 275602 — refer to the same Elubat swiss unit. The charge controller in this fitting expects a 2.4V Ni-CD cell at this exact form factor. Swapping chemistry or voltage causes charge controller faults and failed compliance tests.
• Bench tested on actual hardware: We ran this cell through a full charge cycle and a simulated mains-failure activation. The BMS accepted the cell without fault, and the charge indicator stepped from red through to green within the expected float window.
• First test cycle after installation: Within 24 hours of fitting, hold the test button for the full rated duration. This forces one complete discharge-under-load cycle, lets the charge controller register the new cell capacity, and confirms the fitting will pass its next scheduled compliance inspection.

Emergency light failing its duration test after battery replacement

A fresh Ni-CD cell shipped from storage carries a partial charge, not a full one. The charge controller in the 275 602 fitting uses a float charge strategy — it tops up slowly and does not condition a new cell to full capacity on its own before the first test. If the fitting is tested before the cell has completed one full charge-discharge cycle, the light will dim or cut off early. Run a manual test within 24 hours of installation, allow the fitting to recharge fully, then retest. After that first cycle, the cell will reach its rated 2000mAh capacity.

Charge indicator staying red after new battery installation

A cell that has sat in storage for several months can present a resting voltage slightly outside the float acceptance window the 275 602 charge controller expects. When that happens, the controller holds the fault or charging state and the indicator stays red. In most cases, leaving the fitting on mains power for 12–24 hours allows the trickle charge to bring the cell voltage into the acceptance range and the indicator steps to green without any further action. If the red LED persists beyond 24 hours, check that the cell connections are seated and that the terminal voltage reads at least 2.2V with a multimeter before assuming a controller fault.