The batteries have to be new, bought recently, and preferably all from the same brand.Unscrew the screw at the bottom center of the counter.
Place the batteries in and make sure they are in the right +/- position.

Place the lid back on, starting with the top side where there is a notch inside. Then slide the bottom part back into place.
Repeat these steps on the second box.
Unplug the data collector and plug it back again to restart the system.
Inform support team that the intervention took place by sending an email at support@affluences.com.