Replace the metal battery strap to hold the replacement battery in place. Pull the internal watch unit free of ... Consult the numbers on the old watch battery to determine what type of replacement ...

[Wolf] had a Polar brand exercise watch that ... ditched the watch and built an Arduino-based heart rate monitor. He’s still using the chest strap and was happy to find that SparkFun sells ...

which is why Polar strongly recommends that the watch be sent to the company for battery replacement. Polar recommends that the batteries in its heart-rate monitor be replaced by professionals; ...

When exercising he wears a Polar heart rate monitor which sends data from a chest strap to his wristwatch. But his exercise bike also has a heart rate readout that depends on your hands touching ...