You can check the Movable switch battery life by following these steps:
Navigate to the the movable switch info screen pressing the 'i' button:
Then go to the movable switch and press the wake up button on the front plate.
The battery life will display on the info screen.
If the batteries are below 30% or if you are seeing erratic behavior we recommend replacing the batteries. In normal use they should last several years. They may last less time if the switch is used very frequently or if the switch is frequently added and removed from the account or frequently reprogrammed.