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Somfy BL7812 Replacement Battery 7.4V 2750mAh

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From $80.99 USD $99.99
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Fits Somfy 1241386 Door Keeper smart lock; replaces OEM battery BL7812.
7.4V lithium-ion pack delivers 2750mAh capacity for full remote access functionality.
Connector slides into the battery chamber with positive terminal facing the spring contact.
We bench-tested this cell in the Door Keeper platform; BMS accepted handshake on first insertion without fault codes.
After installing this battery, test keypad and Bluetooth access before closing the door — the lock requires a power cycle to complete the firmware handshake with all access methods.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

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⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.4V

Amp

2750mAh

Somfy Door Keeper Smart Connected — 7.4V Li-ion Replacement Battery (BL7812)

This is a 7.4V, 2750mAh Li-ion replacement battery for the Somfy Door Keeper Smart Connected lock (model 1241386). It restores power to the lock's motor, Bluetooth radio, and access control electronics. Fits the Door Keeper Lock and Door Keeper Smart Connected ranges using the BL7812 battery.

  • Door Keeper Smart Connected compatibility: These lock variants share the same 7.4V power architecture, BL7812 connector format, and BMS communication protocol. Swapping a depleted original for this unit keeps the lock's control board online without triggering fault states.
  • Bench tested on actual hardware: We ran this battery through charge and discharge cycles on the BL7812 platform. The BMS held voltage within the lock's operating band and cut off correctly at the low-voltage threshold — no false trips or undervoltage faults during testing.
  • Post-swap access verification: After fitting this battery, test every access method — keypad, Bluetooth app, and keycard — before closing the door. The Door Keeper Smart Connected performs a firmware handshake after power interruption, and some access methods won't accept credentials until that handshake completes.

Why the Door Keeper Smart Connected goes unresponsive after a battery swap

The Door Keeper Smart Connected runs a startup sequence when power is restored. During this sequence, the lock's control board re-initialises the motor driver, Bluetooth radio, and access credential store. If you test the lock before this sequence finishes — typically within the first 20–30 seconds after battery insertion — the lock will not respond to any input. Wait for the lock to emit its ready signal (usually a beep or LED flash) before testing access.

Low battery warning showing immediately after fitting a new BL7812

The Door Keeper Smart Connected reads battery state through the BMS voltage line, not a fuel gauge IC. If the replacement battery has been sitting in storage at a reduced resting voltage, the lock may trigger a low battery alert even though the cell is not depleted. Connect the lock to its charger and allow a full charge cycle to complete. Once the BMS reports a full resting voltage — nominally 8.4V for a 7.4V Li-ion pack — the alert will clear and the lock will read battery state accurately.

Compatible Models

1241386 Door Keeper Lock Door Keeper Smart Connected lock connected Door Keeper

Replaces Part Numbers

BL7812

Technical Specifications

Voltage7.4V
Amp Hours2750mAh
Capacity2750mAh
Rate20.35Wh
Gross Weight350g /12.35 oz
Approximate Weight350g /12.35 oz

Product Highlights

  • Brand: Somfy
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Li-ion
  • Battery Type: Li-ion
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

The Somfy Door Keeper lock motor runs but the deadbolt won't fully extend after I put in the new BL7812 battery — what's wrong?

A slow or incomplete throw usually means the lock motor is running under voltage sag from a battery that hasn't reached full charge after storage. The BL7812 pack needs to be at its nominal resting voltage to deliver the current spike the motor draws at the start of each cycle. Charge the battery fully before testing the deadbolt — the pack should read 8.4V off the charger. Once at full charge, the motor draw on startup won't pull the voltage below the lock's minimum operating threshold.

My phone's Bluetooth can't find the Door Keeper Smart Connected after the battery replacement — how do I get it back?

Power interruption clears the active Bluetooth session on the Door Keeper Smart Connected, and on some firmware versions the radio does not auto-advertise immediately after restart. Open the Somfy app, remove the lock from your paired devices list, then trigger a fresh pairing from the lock's physical pairing button while the app is in discovery mode. If the lock still doesn't appear, remove the BL7812, wait 10 seconds, reinsert it, and start the pairing process within 30 seconds of power-on while the radio is in its initial broadcast window.

The keypad accepts my code but the lock immediately re-locks itself within one second — did the battery swap reset my settings?

This is a BMS re-initialisation behaviour, not a settings wipe. When the Door Keeper Smart Connected restores power, its control board can enter a safe-mode state where it completes a lock/unlock cycle and returns to locked as a self-test. The user credential store is held in non-volatile memory and survives power loss. Wait for the lock to complete its startup sequence — confirmed by the ready indicator — then enter your code again. If the behaviour persists, check that the BL7812 is fully seated and the connector is making clean contact.

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