KeyLock F 7400-12 6V Replacement Battery 2300mAh Alkaline

KeyLock F 7400-12 — 6V Alkaline Replacement Battery

This is a 6V 2300mAh alkaline battery for the KeyLock F 7400-12 electronic door lock. It replaces the internal power cell that drives the lock motor, keypad, and wireless modules. At 56.50 x 52.00 x 14.40mm, it fits directly into the battery compartment without modification.

• F 7400-12 power rail: The F 7400-12 runs all access logic — keypad, Bluetooth, motor driver — off a single 6V alkaline cell. Voltage must stay above the lock's minimum threshold or the controller rejects commands before the motor even engages.
• Bench tested on actual hardware: We cycled this battery through motor actuation and keypad polling sequences. The lock's BMS accepted the cell immediately with no low-voltage alert on insertion.
• Post-swap access verification: After fitting this battery, test every access method — keypad code, Bluetooth app, and any keycards — before closing the door. Some F 7400-series locks run a firmware handshake after a power interruption that must complete before all credential types are accepted again.

Lock beeping low-battery warning immediately after fitting a new cell

Alkaline cells that have sat in warehouse stock for an extended period can measure 6V open-circuit but sag under motor-start load. The F 7400-12 samples voltage during the first actuation, not at rest. If the cell can't hold voltage through that initial motor draw, the controller logs a low-battery event. Use a cell from fresh stock and check the printed expiry date — anything beyond two years of storage is suspect. Confirm resting voltage reads at or above 6.0V with a multimeter before installing.

Bluetooth app not reconnecting to the lock after battery replacement

Power interruption during a battery swap clears the lock's active Bluetooth session. The F 7400-12 does not automatically re-advertise to paired devices on every restart — it waits for a manual prompt on some firmware versions. Open the lock's companion app, navigate to the device list, and force a rescan or tap "reconnect." If the lock still doesn't appear, remove the battery for 10 seconds, reinsert it, then retry the app scan within 30 seconds of power-up.