If you have the impression on your phone that the tracking consumes too much battery then please close the Moves app. Do not worry, all of your tracks will still be captured by Moves and sent safely to Changers. In iOS, the app is closed by double-clicking on the Home button, which displays the programs opened on the phone. Go to the Moves app and close it with a "swipe". Please note that using Moves may take several hours to display the measured routes in the Changers app.