To replace the battery on the 4400 series:

1. The center LED on the lock keypad will light yellow to indicate low battery.
2. Unlock and open the lock.
3. Pull out the battery drawer at the bottom of the lock and remove the old battery*.
4. Install a new CR2450 battery with the positive (+) side facing the back of the lock.
5. Close the battery drawer.
   * The battery drawer will only fully extend when the lock is in the open position.

To replace the battery on the 4401 series:

1. The center LED on the lock keypad will light yellow to indicate low battery.
2. Unlock and open the lock.
3. With the back of the lock facing you, pull the bottom cover down to remove it.
4. Use a coin to turn the slot in the battery door 90 degrees counter clockwise. *Open the battery door & remove the old battery.
5. Install a new CR2 battery with the positive (+) side facing to the right.
6. Close the battery drawer, turn the slot back 90 degrees clockwise & replace the bottom cover..
   * The slot in the battery door will only turn when the lock is in the open position.

*Please note that after installing a new battery, the low battery icon will no longer display in the app, after the app and the lock communicate with each other. However, it will take between 2 to 24 hours for the yellow LED to stop displaying on the lock itself.

To unlock the 4400 series with an external battery:

1. If the battery dies when the lock is locked, pull the battery drawer out part way until it stops to expose the jump contact point. Do not force the drawer open any further.
2. Hold a new CR2450 battery in the slot at a 45 degree angle, with the positive (+) side facing the front of the lock.
3. While holding the battery in place, with an authorized mobile device within range of the lock, press any button on the lock (if in Touch Unlock mode). If lock does not unlock, enter the Primary Code on the lock keypad.
4. When unlocked, open the lock, pull out the battery drawer and install a new CR2450 battery.
5. Close the battery drawer.

To unlock the 4401 series with an external battery:

1. If the battery dies when the lock is locked, pull down to remove the bottom cover.
2. Hold a 9V battery to the jump contacts on the bottom of the lock.
3. While holding the battery in place, with an authorized mobile device within range of the lock, press any button on the lock (if in Touch Unlock mode). If lock does not unlock, enter the Primary Code on the lock keypad.
4. When unlocked, open the lock and the battery door and install a new CR2 battery.

*Please note that after installing a new battery, the low battery icon will no longer display in the app, after the app and the lock communicate with each other. However, it will take between 2 to 24 hours for the yellow LED to stop displaying on the lock itself.