Now that I've used the Polar Blue HRM for several months, here's a couple of observations. Compared to my old Sigma HRM, which uses 2032 battery, the Polar blue doesn't last as long. Both 2032 and 2025 are 3 volt batteries, but 2032 lasts longer. Here's the specs for each battery.
Lithium 2032
3V
220mAh
Lithium 2025
3V
150mAh
What does that mean in practical terms? Assuming you use the HRM every day for 1 hour, 2025 will last roughly 2-2.5 months. My sigma HRM with 2032 last for about 4 months on 1 battery. Last year I rode about 5800 miles and needed to change the battery on the sigma HRM once. Basically 2 batteries from March - November.
At the current rate, I will need about 4 batteries with the Polar blue HRM.
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