Volvo XC40 Owner's Manual page 224

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.
222
Insert a new battery with the positive side
(+) facing upward. Do not touch the con-
tact surfaces of the remote key battery.
Place the edge of the battery down-
ward into the holder. Slide the battery for-
ward until it locks into place under the two
plastic catches.
Press the battery downward until it
locks into place under the upper black
plastic catch.
NOTE
Use batteries with the designation
CR2032, 3 V.
NOTE
Volvo recommends that batteries used in
the remote control key satisfy UN Manual
of Test and Criteria, Part III, sub-section
38.3. The factory installed batteries and
batteries replaced by an authorized Volvo
workshop satisfy the above criterion.
Replace the battery cover and turn it
clockwise until it points to CLOSE.