How do I properly install the batteries in the IB1C91?
Insert the batteries into the battery compartment while respecting the indicated polarities. Incorrect battery polarity can cause the batteries to leak acid and damage the chronothermostat, invalidating the guarantee. Note that if only one of the two pairs is reversed, the device will still work but the battery life will be halved.
From the official Finder IB1C91 Bliss Wifi Chrono Thermostat manual, page 6
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