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Join Date: Aug 2010
Location: Madison, WI
Posts: 11,209
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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My HRM was reading erratically low yesterday, when I got home the battery voltage (CR 2032 battery) was down to 2.7v, put in a new battery.
In my case, if my chest strap was closer to the receiver unit, it read ok, but it had to be closer than normal. Thus, I think the radio signals were weaker with weaker battery.