My Varia RTL 510 is 2 years old. The red light goes on while charging. It is supposed to be a blinking green light while charging. Garmin says it is due to a bad USB port and they will replace it with a remanufactured one for 100 bucks! The warranty on the one they are sending me is 90 days. So I will have spent 300 bucks in 2 1/4 years for a rear tail light. I feel like this premium product should have a more reasonable warranty! I’m not happy Garmin.