Replacing The Battery - Volvo XC90 Owner's Manual

Maintenance and service
Battery (Contd)
Removing oxyhydrogen gas
The battery can develop oxyhydrogen, which is
highly explosive. An evacuation hose draws
any oxyhydrogen gas from around the battery
out of the car and prevents gas from accumu-
lating in the passenger and cargo compart-
ments. If you must change the battery for some
reason, it is imperative that the evacuation hose
is connected to the new battery and that it is
routed to the outlet in the bodywork.
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Replacing the battery

Do as follows once you have unscrewed the
console and battery cover and wish to remove
the battery:
• Check that the ignition is switched off.
• at least 5 minutes before touching
any electrical terminals (so that the infor-
mation in the car's electrical system can
be stored in the different control
modules).
• Then disconnect the positive lead and the
evacuation hose for the oxyhydrogen.
Do as follows when installing the battery:
• Set the battery in place.
• Then connect the negative lead.
• Make sure the evacuation hose is
correctly connected to both the battery
and the outlet in the bodywork.
WARNING!
The battery contains oxyhydrogen, which is
highly explosive. Be sure that the evacu-
ation hose is correctly connected!