Sanyo 100502SE 6V Replacement Battery 2000mAh Ni-MH

Sanyo 100502SE — 6V Ni-MH Replacement Battery

This is a 6V 2000mAh (12Wh) Ni-MH replacement cell for the Sanyo 100502SE emergency lighting unit. It slots into the fitting and restores the unit's ability to power emergency illumination during a mains failure. Dimensions are 52.38 × 43.46 × 27.20mm — verify these against the existing cell before ordering.

• 100502SE fitting compatibility: The 100502SE uses a 6V Ni-MH cell because its charge controller is calibrated to Ni-MH float and charge-termination characteristics. Swapping to a different chemistry will confuse the controller's delta-V cutoff and risk overcharge or a permanent fault state.
• Bench tested on actual hardware: We ran this cell through a full charge cycle and a load discharge at the rated draw. The cell reached 6V float within the expected window and held voltage under load without tripping early cutoff.
• 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 and confirms the cell accepts load before your next scheduled compliance test.

Charge indicator staying red after new battery installation

A replacement cell shipped from storage can sit at a lower resting voltage than the charge controller's float acceptance window. When the controller sees a voltage outside that window, it flags a fault rather than beginning a normal charge cycle. Leave the fitting powered for 12–24 hours — the controller will trickle the cell up into acceptance range and switch to green once it crosses the float threshold, typically around 6.0–6.3V.

Emergency light failing its duration test after battery replacement

A new Ni-MH cell does not deliver its full rated capacity on the first discharge. The cell needs one complete charge-discharge cycle to reach the 2000mAh figure quoted on the label. If the unit dims or cuts out before the test duration ends, it almost certainly has not had that conditioning cycle. Charge the unit for a full 24 hours, then run the test button again — most fittings will pass on the second attempt.