I'm fairly certain that I've used it in the past successfully to a battery life % below 20- was that a fluke? Anyone else have their Garmin shut down at a relatively high battery life %? Ironically I gave up on my 205 finally after more than 5 yrs of use (and a 'fixing' 1/2 way thru by Garmin) because it wasn't dependably getting a charge anymore. But it wasn't worth paying them $90 for another possible 'fixing', and the 310 got such great battery-length reviews so I figured it was worth the investment. I really wanted the super long battery life b/c I sometimes go 2-3 days w/o electricity (or not having space to carry a special battery charged charger for the Garmin) where I would like to record multiple long workouts.
Thanks for any thoughts on the matter!