Apps like MayMyRide and Strava usually are the drain on the phone battery. I had several issues with both apps, MMR draining my battery far faster than normal, almost a rate of 20% an hour for some reason, and Strava not recording my rides. Currently waiting on my Garmin EDGE 810 to show up any day here so I can start using that. This will replace a Cateye Stealth 10 that I absolutely despise.