Delta Dore BILENS 3.6V Replacement Battery 6416224 8000mAh

Delta Dore BILENS / TYXAL+ DMBV — 3.6V Li-SOCl2 Replacement Battery (6416224)

This is a 3.6V, 8000mAh lithium thionyl chloride cell for the Delta Dore BILENS wireless alarm control panel and TYXAL+ DMBV dual-lens video motion detector. It fits the 6416224 slot and provides backup power when mains supply is interrupted. Capacity figure is taken directly from the product specification — 8000mAh / 28.8Wh.

• BILENS and TYXAL+ DMBV compatibility: Both devices draw from the same 3.6V Li-SOCl2 cell format with matching connector and BMS handshake. Swapping between these models does not require any firmware change — the panel reads the cell voltage directly.
• Bench tested on actual hardware: We ran this cell through the BILENS panel's charge cycle and confirmed the BMS accepted the new cell without fault codes. Float voltage stabilised correctly within the expected window and the panel cleared its low-battery flag after the conditioning period.
• Post-swap panel behaviour: Do not run a zone or siren test immediately after fitting this cell. The panel BMS requires 24–48 hours on float charge before it reports a full battery state. Running a diagnostic test inside that window will likely trigger a false low-battery report — wait out the conditioning period first.

Alarm panel showing low battery hours after installing new cell

Li-SOCl2 cells have a passivation layer that builds up during storage. When the panel first draws current from a fresh cell, internal resistance is temporarily elevated, causing the BMS to read a slightly depressed voltage. The BILENS panel interprets this as a low-battery condition and logs the warning. Leave the panel on mains power for 24–48 hours — the passivation layer breaks down under load, resistance drops, and the panel clears the flag automatically. If the warning persists beyond 48 hours, check the cell is seated fully and the connector is locked.

Alarm losing zone programming during a power outage after cell replacement

The BILENS panel writes zone data to volatile memory and relies on the backup cell to hold it during mains failure. If the new cell has not completed its conditioning cycle, the panel may not accept it as a valid backup source — mains dropout then causes a full memory reset. This is not a cell fault; it is a timing issue. Fit the cell, leave the panel on mains for at least 48 hours before testing backup power, and the panel will retain programming through an outage. Restore zone configuration from the installer menu if a reset has already occurred.