From the Home screen, tap on the BrightLock whose battery level you want to know.
This open a new screen. Here you can see the lock's battery level, right under the door name. 

To avoid having your BrightLock run out of battery, we'll let you know when a lock has a low battery level :
• a 1st time when the battery gets to 20%
• a 2nd time when it falls to 10%

💡 Your batteries are dead? You might want to check this article on how to replace them.

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