I have been using the trail exploration (gpx) feature on my Adventurer happily for 6 months on runs up to 8 hours, I dont have any other features/trackers switched on. At weekend the battery went from fully charged to dead after 10 hours, following a downloaded trail. I expected to get 15+ hours so was surprised. Someone said it might have been due to Bluetooth being on...fone is linked via tomtom app and it auto updates to Strava. I need advice on how to max battery life in gpx mode for long running events...any feedback gratefully received!