Senior Member
Join Date: Aug 2010
Location: Madison, WI
Posts: 11,216
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
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Years ago I had a heart rate monitor strap, the battery cover was held on with screws, sweat got in and corroded it. That is why I made my comment above about tape.
I usually replace my own watch batteries. I find that if you put a tiny bit of grease on the screw threads before you screw the screws in, they come out easier next time.
I bought a cheaper Garnin strap from Asia on Ebay, took a month to arrive. Mine does not use little screws, uses a coin to turn the battery cap off. Not sure if the trade war will mess that option up or not.
Good luck with your efforts.