- Plug the battery pack into the charger and make sure a red or green LED turns on.
- Make sure your WHOOP is off-wrist and the metal clasp is snapped shut. Slide the battery pack onto your WHOOP to charge (the battery pack should still be plugged into the charging cable and have an LED on).
- Wait 5-10 minutes.
- With the battery pack and WHOOP pair still attached to the charger, place your thumb on the bottom of the sensor (the area inside the red oval on the underside of the WHOOP) for 15 seconds.
- Remove your thumb from the sensor. If successful, green LEDs should appear on the bottom of the sensor.
3.0 Sensor Troubleshooting
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