Originally Posted by
ddub
That's sad to hear you had issues with the 820. My experience is favorable. Have done a couple of 12+ hour and lots of 6-8hr rides with no issue. I wasn't using the maps screen however. Made certain it was freshly charged and it was good to go. I'll keep mine.
I had some issues with battery life, made a couple of changes to the settings that helped immensely. Set the screen to backlight timeout after 15 seconds, turned off GLONASS (works fine on just GPS), and set recording interval to smartrecord (since I have wheel sensors on both bikes anyway). Yesterday I finished a century (using turn-by-turn course instructions, wheel sensor, cadence sensor) with approx 30% battery life left after almost 7 hours.