Winkhaus Blue Chip LS14250 Replacement Battery 3.6V 1200mAh

Winkhaus Blue Chip Series — 3.6V Li-SOCl2 Replacement Battery (LS14250)

This is a 3.6V, 1200mAh Li-SOCl2 cell using the LS14250 form factor. It fits the Winkhaus Blue Chip electronic door lock range, including the Zylinder BC 11, BC 12, and BC 14 MK. The Blue Chip system draws from this cell to power the locking motor, access control logic, and authentication electronics.

• Blue Chip model compatibility: The BC 11, BC 12, and BC 14 MK all share the same LS14250 cell slot and 3.6V supply rail. The lock's control board expects this exact voltage — substituting a 3.0V CR2 or AA cell will cause the motor to underperform or the authentication circuit to fault.
• Bench tested on actual hardware: We cycled this cell through a simulated lock sequence — locking motor actuation, keypad polling, and access-log write. The BMS held stable voltage under motor-start inrush and the cell recovered cleanly between actuations.
• Post-swap initialisation on Blue Chip locks: After fitting this cell, test every access method — keypad, Bluetooth, and keycard — before closing the door. Some Blue Chip units run a firmware handshake after any power interruption. That sequence must complete while the door is open or the lock may reject inputs.

Why the Blue Chip lock won't respond immediately after a battery swap

Li-SOCl2 cells have a passivation layer that builds up during storage. This thin film on the anode temporarily increases internal resistance when the cell is first put under load. On the Blue Chip, this can look like a dead lock — the indicator does nothing and the motor doesn't fire. The passivation breaks down within the first few actuation attempts as current flows through the cell. If the lock still doesn't respond after three to five trigger attempts, check polarity and confirm the cell is seated flush in its contacts.

Low battery warning showing immediately after fitting a new cell

The Blue Chip's control board reads cell voltage at startup to set its charge status flag. If the new cell has been in storage and its passivation layer hasn't cleared, the initial voltage reading can dip below the lock's low-battery threshold — typically around 3.2V under load. The lock logs that reading and raises the warning. Actuate the lock five to ten times to burn off the passivation layer, then power-cycle the unit by removing and reinserting the cell. The voltage should stabilise above 3.4V and clear the warning.