I was directed by Garmin to the forum board which (as they said) did have lots of other uploads about battery life, but none which answered my question not pointed to a solution. I have Edge Expore only a year old, running latest software. My mate has the same unit, but his battery lats much longer e.g. yesterday alert only 3 hours mine was indicating only 20% remaining whist his was o 80%. I was ridng a cours from Garmin Explore, in battery save mode & running HRM & cadence sensors. Is my battery knackered & if so, what can be done about it please?