Garmin · Cycling & fitness
Garmin HRM-Dual battery
1 × 3V lithium coin cell
How to replace it
| Compartment | Module back cover (4 screws) |
|---|---|
| How to open | Remove four screws on the back of the module; lift cover |
| Tools | Torx T5 (pre-Sep 2020 units: Phillips #00) |
| Orientation | Positive (+) side facing up |
| Notes | Wait 30 seconds before inserting the new battery. Do not overtighten screws. |
| Seal / O-ring | Do not damage or lose the O-ring gasket |
| Re-pair / reset | Yes |
| Re-pair after change | Yes |
| Access | Simple screwdriver |
| Gasket / O-ring present | Yes |
Important
- After battery replacement you may need to pair the HRM with your device again.
Sources
Helpful for this device
Optional tools for opening, testing or charging — separate from the battery answer.
- iFixit Essential Electronics Toolkit
Opening compartments that need precision bits
- Fluke 101 Digital Multimeter
Accurate open-circuit voltage and basic electrical checks
- Digital multimeter
Measure open-circuit voltage and general electronics checks
New battery but still not working?
A fresh 1 × CR2032 should restore Garmin HRM-Dual if the battery was the problem. Work through the checks below before replacing the device.
- Check orientation
Confirm the cell is seated correctly: Positive (+) side facing up
- Check the battery type
This device needs 1 × CR2032 (lithium). Rechargeable cells are not supported for this device. Same size does not always mean the same battery.
- Check known model-specific issues
Re-pairing or a short reset may be required after a battery change. Do not damage or lose the O-ring gasket After battery replacement you may need to pair the HRM with your device again.
- Confirm the battery itself
For most coin cells, fitting a known-good fresh cell of the correct code is simpler than capacity testing.
- Still not responding?
If a correct, fresh battery installed properly does not restore the device, the fault may be elsewhere — the device may need service or replacement.
Need to replace the device?
Garmin HRM-Dual is still sold new. Only buy another if a fresh battery and the checks above did not help.