Replace the original Wellntel battery* with another extreme weather battery pack, for maximum life in a wide range of outdoor temperatures.
The Wellntel Sensor is designed to operate up to about 10 months on one extreme weather battery pack. This is a factory replacement for the original included battery.
Open the Wellntel sensor cap by removing the your padlock (you may have entered the combo when you registered). Using a small flathead or phillips screwdriver, uninstall the battery leads from the original pack, and replace with the new pack, taking care to screw the red (+) lead into the + connector, and the black (-) lead into the – connector.