Originally Posted by
jadocs
Never heard of this before and I've never had to re-pair my Wahoo cadence sensor when I replaced the battery.
I haven't had to re-pair my Bontrager DuoTrap cadence/speed sensor. My Wahoo Tickr, which is paired to my phone with BT has a unique BT identifier (I actually have two, because I had lost one temporarily, and it has a different identifier).
I have no idea if it uses a reed relay or not.