WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Battery And Shelf
Courtesy of VOLVO CARS OF NORTH AMERICA.
Remove the battery and the battery shelf.
NOTE:
If the car is fitted with cruise control you must undo the vacuum hose and leads to the vacuum motor.