It takes one CR2032: a coin battery, about the size of a nickel.
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Some child-safe CR2032 packs have a bitter coating. In the Garmin HRM-Pro it can stop the battery touching the contacts, so it seems dead after you change it. Buy an uncoated pack.
You’ll need: Small Phillips screwdriver
Undo the four screws on the back of the module and lift the cover.
Remove the old cell and insert the CR2032 with + facing up. Check the O-ring sits in its groove.
Refit the cover and tighten the screws in a cross pattern so the seal compresses evenly.
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A new battery usually lasts about a year in this device.
That’s around October 2027.
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It takes CR2032, a coin battery.
Yes. DL2032, ECR2032, 5004LC are the same battery with other names.
Usually about a year, depending on how much you use it. Most devices warn you when it gets low.