I have Forerunner 45 and chest strap. I'm thinking of getting a second of each so I always have a backup if battery is out when I want to use one. Is that a good idea? Can you mix and match them, so that two chest straps would pair (one at any given time) with the same wrist 45, or two wrist Forerunner 45 (one at any given time) would pick up signals from the same chest strap? Or is it just going to cause headaches with not picking up signal and needing to re-pair all the time?
