Assa Abloy UNI TURN 28.8V Ni-MH Backup Battery 3000mAh

Assa Abloy UNI TURN — 28.8V Ni-MH Replacement Battery (45A030CE00002)

This is a 28.8V, 3000mAh Ni-MH battery pack for the Assa Abloy UNI TURN automatic door operator. It provides backup power to the door controller during mains failure, keeping the door operational for emergency egress. Capacity is 86.4Wh — matched to the OEM specification.

• UNI TURN backup power rail: The UNI TURN controller draws from the 28.8V backup rail the moment mains power drops. The battery must match that exact voltage — any deviation and the backup circuit won't engage. This pack runs the same cell count and BMS thresholds as the original to satisfy that handshake.
• Bench tested on actual hardware: We cycled this pack through simulated mains-fail events and confirmed the BMS released voltage to the controller correctly. The pack held above the UNI TURN's low-voltage cutoff threshold across multiple discharge cycles.
• Post-installation load test: After fitting, manually trigger a power-fail simulation during a low-traffic period. Automatic door backup batteries must complete at least one full open cycle under actual motor load before the installation is signed off — a resting charge on the bench does not confirm real-world performance.

Door not completing a full open cycle on battery backup

The UNI TURN motor draws its highest current at the start of each cycle — this is the load that exposes a weak or partially charged backup battery. If the pack voltage sags below the controller's cutoff during that initial surge, the door stalls mid-cycle or resets to closed. A new battery that hasn't completed a full 24-hour charge will show exactly this behaviour even though the indicator light reads green. Always charge the replacement pack for a full 24 hours before running a live power-fail test.

Controller losing door programming after a power outage

The UNI TURN stores timing, speed, and hold-open parameters in volatile memory that relies on the backup battery to retain settings when mains power drops. If the battery is depleted or has drifted below around 24V under no load, the controller loses that backing voltage and wipes its configuration on every outage. The symptom is a door that reverts to factory defaults — slow speed, no hold-open delay — after each power event. Replace the battery, charge fully, then re-enter the door parameters via the controller keypad.