Reset
When you first launch the app it should be rest to the last reading. You have to active at it by changing a state of anything. This could be changed with one line of code.
Not enough ratings yet to assess Watch Battery Logger.
Watch Battery Logger appears to be a legitimate app. AppsHunter Legitimacy Score for Watch Battery Logger is 80/100.
Based on 80 of 100 points across 7 verification signals from App Store and developer data.