Steps to replace the battery:
1. Insert the new battery into the cover, observing polarity.
NOTE: Do not damage or lose the O-ring gasket.
2. Twist the cover clockwise until the marker points to locked.
The LED flashes red and green for a few seconds after battery replacement.
When the LED flashes green and then stops flashing, the device is active and ready to send data.
Guide video for for Battery:https://www.youtube.com/watch?v=VsJ329K2Ufw