Hi, thank you for contacting JustAnswer.com. My name is Russell. I will do my best to provide the right answer to your question; It is fair to let you know that though I can advise you on Garmin products, I am not a representative of Garmin, nor afilliated with them.
How old are the two Garmin watches, as of now, measured from their date of purchase?
How long (in hours or minutes) does a full charge last when you are actively using one of these watches, or either of them?