Symptoms
- Low battery warnings appear often
- Batteries drain in a couple months or less
- Lock feels slow or hesitant right before batteries die
Likely causes
- CommonCold weather reducing battery capacityBattery chemistry is less efficient in cold temperatures, especially on exterior doors in winter.
- CommonDeadbolt binding against a misaligned strike plateIf the motor has to force the bolt through a tight or misaligned strike plate, it draws much more power.
- PossibleFrequent use from a busy householdMore lock/unlock cycles naturally use more battery.
- PossibleLow-quality batteriesOff-brand batteries can underperform compared to recommended types.
- PossibleFrequent connectivity activity (Wi-Fi models)Wi-Fi-connected locks use more power maintaining a network connection than Bluetooth-only models.
What to do
- Check that the deadbolt moves smoothly by hand when the door is open; binding here makes the motor work much harder.
- Adjust the strike plate if the bolt has any resistance engaging it, since this directly affects battery life.
- Use the specific battery type and brand recommended by the manufacturer, typically lithium for cold climates.
- Check the app for a battery usage or activity log to see if unusually frequent locking/unlocking is occurring.
- If it's a Wi-Fi-connected model, confirm signal strength is good, since a weak signal makes the lock work harder to stay connected.
- Keep spare batteries on hand for exterior doors in winter, since cold weather naturally shortens battery life.
Tools and parts
- Fresh batteries (manufacturer-recommended type)
Lithium batteries for smart lockSearch: “lithium batteries for smart lock cold weather”
When to call a pro
Call a locksmith to properly align the strike plate and deadbolt if binding is causing excessive battery drain and you're not comfortable adjusting it yourself.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.