Step 1: Open the WHOOP app and note the current battery level of your WHOOP.
Step 2: Plug the battery pack into the charger. Make sure a red or green LED turns on.
Note: If no LEDs illuminate on the battery pack, make sure the orientation is correctly aligned, as shown in the below image. You can also try a different charger, cable, or power outlet.
Step 3: Remove your WHOOP from your wrist and attach the battery pack to it to charge (which is still plugged into the USB charging cable).
Step 4: Wait 30-45 minutes.
Step 5: Remove the battery pack and place your WHOOP back on your wrist.
Step 6: Open the WHOOP app and check the current battery level of your WHOOP.