Volvo S90 2019 Owner's Manual page 241

Turn the key over, move the button to
the side and slide the rear cover slightly
upward.
The cover will loosen and can be
removed from the key.
7 Included in vehicles equipped with keyless locking/unlocking*.
Use a screwdriver or similar object to turn
the battery cover counterclockwise so the
markers point to OPEN.
Remove the cover carefully by pressing
e.g. a fingernail into the indentation.
Pry the cover up.
KEY, LOCKS AND ALARM
The battery's positive side (+) faces
upward. Carefully pry out the battery as
shown in the illustration.
CAUTION
Avoid touching new batteries and their
contact surfaces with your fingers as this
will impair their function.
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