Volvo XC90 Owner's Manual page 249

The battery in the smaller key without buttons
(the Key Tag) cannot be replaced. A new key can
be ordered from an authorized Volvo workshop.
CAUTION
An end-of-life Key Tag must be turned in to
an authorized Volvo workshop. The key must
be deleted from the vehicle because it can
still be used to start the vehicle via backup
start.
7 Included in vehicles equipped with keyless locking/unlocking*.
Opening the key and replacing the
7
battery
Hold the remote key with the front side
(with the Volvo logo) facing up and move the
button on the key ring section to the right.
Slide the front cover slightly upward.
The cover will loosen and can be
removed from the key.
KEY, LOCKS AND ALARM
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.
* Option/accessory.
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