Polar H10 Battery level in ANT+ on K2

Replaced my old HRM with a Polar H10, but got some weirdness happening with my Karoo 2. If I connect to the H10 with Bluetooth, the battery level (with a brand new battery) shows 100% full, as expected. If I then switch the connection to ANT+, the same strap with the same battery, a minute after showing full in BT, shows “MID” battery level (50% on the bar graph which is yellow in colour, not green). H10 firmware is 3.3.1 (latest one available), K2 is using 1.559.2149.12 with radio firmware 2.9.9. Anyone else seen this?

Steve MacMillan

June 12, 2025 16:24

Hi Jason. My Polar H10 battery reading is (nearly) always at 'MID' level whenever I check it on my Karoo 2. It has been that way ever since I got the Karoo 2! And, that is for 2 different Polar H10 straps.

Jason Green

June 12, 2025 21:15

Nice to know it’s not just me, not so nice to see it’s a bug that may have been sat there for some time!

Polar H10 Battery level in ANT+ on K2

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