I've had my 820 for ~14 months. Recently, battery life has been bad & getting worse, especially in the cold. This past weekend I went for a two-hour ride when the temp was ~16-20 degrees. My battery was at 100% when I started, but at 10% when I finished. I had a Varia radar tail light, ANT+ speed/cadence, ANT+ HRM and Live Track (I normally have ANT+ power meter pedals, but no this day). I use smart recording & have GLONASS off (that's recent, I had always used GLONASS & GPS along with 1-second recording).
When the 820 was new, the battery would last all day. A few months ago, it started getting worse. Now, it's really bad, especially on cold days.
Any thoughts?
Thanks