1. Switch off the ignition.
2. Wait at least 5 minutes after switching off the ignition before disconnecting the battery so that all information in the vehicle's electrical system can be stored in the control modules.
3. Remove the retaining bracket and unscrew the cover over the battery. Wait at least 5 minutes after switching off the ignition before disconnecting the battery so that all information in the vehicle's electrical system can be stored in the control modules.
4. Disconnect the negative (ground) cable first.

5. Disconnect the positive cable and pull the ventilation hose from the battery.
6. Lift out the old battery and put a new battery into place.
7. Connect the positive cable first.
8. Connect the negative (ground) cable.
9. Be sure that the ventilation hose is securely connected to the battery and that the other end of the hose is properly routed through the ventilation opening in the floor of the battery compartment.

Ventilation hose

10. Reinstall the cover and retaining bracket and screw it securely in place.

NOTE
After the battery has been disconnected or replaced, lock and unlock the vehicle with the central locking system's remote key to reactivate such features as the power windows, moonroof, courtesy lighting, etc.

WARNING
• The battery generates hydrogen gas, which is flammable and explosive. The battery is fitted with a ventilation hose which vents hydrogen gas out of the battery compartment through a ventilation opening in the bottom of this compartment.
If the battery must be replaced, it is essential that the ventilation hose is properly connected to the battery and that it is routed through the ventilation opening provided (see illustration).
• Be sure the ventilation hose is free of debris.
• Only use replacement batteries equipped with a ventilation hose. Consult a trained and qualified Volvo service technician.