in middle of both stair climbing and other cardio workout with a time set for 15 minutes, after a few minutes it give a 15 second countdown to "power saving", however the watch in one case had 2 battery bars and in the second case had been charge

in middle of both stair climbing and other cardio workout with a time set for 15 minutes, after a few minutes it give a 15 second countdown to "power saving", however the watch in one case had 2 battery bars and in the second case had been charged the night before. The activities aren't even partially recorded