The Weret app will notify you that the battery is running low. You will also notice the different behavior of the watches' hands. Check below what will happen when the battery level is under 20%.
The watch indicates that the battery is almost empty by ticking the second hand all 4 seconds.
The Bluetooth Low Energy (BLE) part is deactivated in order to reduce the power consumption. Hour and Minute is working normally, the hand for the seconds is placed at noon and stopped ticking.
The watch moves all hands to noon and disables everything except the internal calendar function. Recommend to charge the watch.
Obs: When in shipping mode AND with battery <20% capacity the watch's hands point down (6)