The battery life of the Plegium Smart Emergency Button is about two years. Storing the device in cold environments can reduce battery life.
You can see the device’s connection status in the Plegium app. If the device won’t connect to the app, the battery is most likely empty.
If you make a test alarm and the green LED on the device does not blink, the battery is most likely empty.
You can replace the battery by opening the back of the device with a small screwdriver. The device uses a CR2032 battery, which is widely available and inexpensive.