Today's useful #homeassistant#automation of the day is a notification when any of our battery-level related sensors are low.
I even managed to find a way where I don't have to add all the sensors to the automation by hand: instead I'm observing the state_changed event, with a filter for only states that have the device_class attribute set to battery.
Together with the Battery Notes custom integration this should make our home much more muggle friendly, so that things don't randomly break only because a battery is low, and instead the smart home's going to proactively notify its users about upcoming issues.
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