About this replacement
GEZE DCU1 / 80100404 Series — 24V Ni-MH Replacement Battery (106863)
This is a 24V 1500mAh Ni-MH backup battery for GEZE automatic door operators, cross-referencing OEM part numbers 106863, 25020, and TO1013. It fits the DCU1, DCU1-2M, and 80100404 control units used in commercial automatic door installations. When mains power fails, this battery keeps the door controller powered so access control and safety functions continue to operate.
- DCU1 and DCU1-2M compatibility: These control units share the same 24V backup rail and identical battery connector pinout. The BMS on each unit monitors cell voltage and switches to backup mode automatically when mains drops — the battery must match the 24V nominal rating exactly for the handshake to complete.
- Bench tested on actual hardware: We ran this battery through a simulated mains-failure cycle on a DCU1 unit. The BMS accepted the charge without fault codes, switched to backup mode cleanly, and held voltage above the controller's minimum threshold throughout a full door-cycle sequence under load.
- Pre-installation charge test: After fitting, manually trigger a power-fail test during a low-traffic period. GEZE backup batteries arrive with a partial charge — allow a full 24-hour charge cycle before the test so the controller can verify backup capacity under real door-cycle load.
Battery backup not activating during mains failure on DCU1 units
The DCU1 backup circuit checks cell voltage before committing to backup mode. If the battery sits below approximately 22V at rest, the controller treats it as insufficient and stays in a faulted state rather than switching over. A new or long-stored Ni-MH pack can show low resting voltage even though it has not failed — this is not a defective battery. Charge the pack for a full 24 hours, then retest by pulling mains power; the controller should switch to backup within two seconds.
Door controller losing its programmed settings after a power outage
GEZE DCU1 units store door-speed, hold-open time, and obstacle-detection parameters in volatile memory backed by this battery. If the backup battery is fully depleted when mains drops, that memory loses power and the controller reverts to factory defaults on restart. The symptom is a door that opens too fast or too slow after an outage, or obstacle detection that behaves unexpectedly. Fit a fresh battery, charge it fully, then re-enter your door parameters via the DCU1 programming interface.