Polar H10
400 h on a coin cell, with Bluetooth and ANT+ both on board. Memory holds one session of up to 30 h, so longer logging still needs a watch or phone.
8.8/10
This score is my reading of published evidence, since I haven't worn the strap. It has the strongest evidence of anything I cover, though the studies are small, and it does one job: heart rate, sent to something else.
Pavel Ryzhikh, 3 November 2026. Scored from published tests and maker data, not from wearing it.
What the maker states
| Battery | 400 h, Coin cell |
|---|---|
| Weight | 60 g, With strap; 21 g without |
| Water rating | WR30 |
| Heart rate sensor | Electrical, chest strap |
| External sensors | Bluetooth, ANT+ |
| Internal memory | One session, up to 30 h |