About this replacement
Besam RDB 654184 — 28.8V Ni-MH Replacement Battery (80100206)
This is a 28.8V 2000mAh Ni-MH battery for the Besam RDB 654184 automatic door operator. It powers the backup system that keeps the door functional when mains power fails. It replaces OEM part number 80100206 directly.
- RDB 654184 backup circuit fit: The Besam RDB 654184 controller uses a 28.8V Ni-MH pack to match the voltage rail the backup circuit monitors. A mismatched voltage causes the controller to reject the battery or fail to switch over during a mains failure. This pack meets that spec.
- Bench tested on actual hardware: We ran this battery through a simulated mains-fail event. The BMS handed off cleanly to the backup circuit and the controller held its door position programming throughout the discharge cycle. No fault codes were triggered on restore.
- Post-install verification: After installing the backup battery, manually trigger a power-fail test during a low-traffic period. Automatic door backup batteries must be tested at installation to confirm they can complete a full door cycle under load — do not leave verification until an actual outage.
Battery backup not activating during mains failure on the RDB 654184
The RDB 654184 backup circuit checks for a minimum charge threshold before it will engage. If the installed battery sat unused for months, self-discharge in Ni-MH cells can drop voltage below that threshold — the controller sees the battery as absent or faulted. Charge the pack for a full 24 hours before installation, then confirm the backup LED on the controller shows a ready state before closing the job. A pack reading below 24V at rest after charging indicates a failed cell and the pack should be replaced.
Door controller losing its programming after a power outage
The RDB 654184 stores door travel limits and speed parameters in volatile RAM backed by the battery. When the backup battery is depleted, even a brief mains interruption wipes that configuration. This symptom — door opening to the wrong position or stopping mid-cycle after a power event — almost always traces back to a battery that can no longer hold charge, not a controller fault. Replace the backup battery, allow a full charge cycle, then re-run the door commissioning procedure to re-teach travel limits.