Your logger uses very little power and has a long battery life. If you want to extend the battery life farther, you can power down the logger when it is not logging. In the power down mode the logger uses practically no power, and can be stored without loosing battery power, as long as the battery shelf life allows (10 years for Lithium batteries, 6 years for Alkaline). This state is useful if the logger is going to be stored without being used for an extended period of time.
To put the logger into the power down mode, select Power Down from the Logger menu.
To check if the logger is in power down mode, check the logger status using the PC. Logger State will be indicated as Power Save Mode.
Note: The power down mode can only be entered when the logger is idle (not logging). In the power down mode the logger's real time clock is not running.