You’ll get a notification from the Nest app when the lock’s batteries are getting low, and a second notification when they’re critically low. So you’ll have plenty of time to replace them before they’re dead. If you need, you can use a 9 Volt battery to temporarily charge the lock, so you can enter your passcode on the lock’s keypad to lock or unlock it.
How to lock and unlock the Nest × Yale Lock if the battery is drained
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