Turned on my Wahoo at the start of the ride and it greeted me with a low battery warning and 1% charge. I know that I charged the thing on Monday morning and I've only taken two 1-hour rides since - it should have had enough juice for a century and more. Had to fall back on my Fitbit tracking (I don't think that the Strava app pairs with HRMs any more, and I at least wanted that data) and fly blind, like some kind of plebe.