The lithium battery voltage is measured by the data logger once per day, and the value is held in the Status table when it is running normally. The voltage is normally extremely stable if the data logger is powered from another source and its temperature is stable. A new battery supplies approximately 3.6 Vdc; it should be replaced when its reading is at or below 2.7 Vdc.
The lithium battery voltage is also read when the data logger is reset or its program is recompiled.