I have written a simple stopwatch app that updates the screen every minute. I do not need seconds. The app does not start a Garmin activity. It just uses a timer:
var activeTimer = new Timer.Timer();
activeTimer.start(method(:timerCallback), 60000, true);
With Bluetooth switched off the App uses almost no battery. In over an hour it does not drop 1%.
With Bluetooth switched on battery drains at a rate of 1% per 10mins. (Not connected to ConnectIQ)
So if I am timing a long walk (no GPS, or heartrate) the battery is draining pretty fast if Bluetooth is on. When bluetooth is off the battery lasts for ages.
I see this on behaviour on the Garmin FR245 firmware v11.10
Its almost as if once the App is running, the watch is constantly using Bluetooth searching for ConnectIQ and draining the battery. Any way of disabling this bahviour?