I slept with 80% charge. in the morning my device was turned off and never turned on. Garmin app last measured my heart rate at 00.38 am. the device is currently turned off and I cannot turn it on.
.
After, I called the service. They said that mk1 may have updated overnight. Will it decrease by 80% on an update? It didn't make sense to me. I have not tried charging. I am currently in another city. The charging cable is not with me.