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v8.6
External Battery Module
16.2. Operating modes
The EBM is designed to charge a Plug & Sense! node once per day during a preprogrammed period of time.
There is a latch button to turn on and off the EBM. This button also includes a red LED to show the user when the
device has started working. It will blink only a couple of times when the device is switched on, to avoid unnecessary
current consumption through it. When the device is on, the button will look like in the picture below.
Figure: External Battery Module, on position
Due to the nature of the EBM battery, its level cannot be monitored. If the LED does not blink when the button
is pressed, the EBM battery could be empty. On the other hand, when the button is off, the battery is physically
disconnected from any circuitry and there is no power consumption from the battery, even if there is a solar panel
present. Finally, the LED will not be on during the charging period for efficiency purposes.
The External Battery Module has 3 operating modes. In order to select them, there is a 3-position rotative selector
switch.
Figure: External Battery Module operation selector