Originally Posted by Lesper4

So I had my first experience with this and I didn't see any mention of the newer models. I did a 300 mile ride with my Garmin 510 and when it was getting low on power I plugged in a li-ion charger. I have no idea how long it should be plugged in for, it was probably a good 10 mins. My Garmin did want to turn off but I stopped it. Eventually my Garmin died about 9 miles from the end (21.5 total hours). Do you think the Garmin even got a charge, I thought 20 hours was their stated limit? Maybe I need to pause the ride and power down before I charge it?