Zehnder RFZ Manuel page 19

Inserting the battery
Note: The cordless switch does not work if the battery
has been fitted incorrectly. An incorrectly fitted battery
can damage the electronics.
The battery must be fitted at the back of the switch.
Insert the battery on the (+) side of the holder with the
engraved plus (+) facing up, and then push the battery
in place on the (-) side (fig. 1).
Battery replacement
Lift the battery out of the holder on the (-) side by
means of a screwdriver (fig. 2). Saved functions are
retained during battery replacement.
Note: Do not throw empty batteries
out with the household refuse, but take
them to your nearest collection point for
chemical refuse.
EN - 19