Garmin Edge 840 Owners Manual - Page 74

Replacing the HRM‍-Dual Battery, Do not damage or lose the O-ring gasket.

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Replacing the HRM-Dual Battery 1 Use the included screwdriver (Torx T5) to remove the four screws on the back of the module. NOTE: HRM-Dual accessories produced before September 2020 use Phillips #00 screws. 2 Remove the cover and battery. 3 Wait 30 seconds. 4 Insert the new battery with the positive side facing up. NOTE: Do not damage or lose the O-ring gasket. 5 Replace the back cover and the four screws. NOTE: Do not overtighten. After you replace the heart rate monitor battery, you may need to pair it with the device again. 68 Device Information

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Replacing the HRM-Dual Battery
1
Use the included screwdriver (Torx T5) to remove the four screws on the back of the module.
NOTE:
HRM-Dual accessories produced before September 2020 use Phillips #00 screws.
2
Remove the cover and battery.
3
Wait 30 seconds.
4
Insert the new battery with the positive side facing up.
NOTE:
Do not damage or lose the O-ring gasket.
5
Replace the back cover and the four screws.
NOTE:
Do not overtighten.
After you replace the heart rate monitor battery, you may need to pair it with the device again.
68
Device Information