Changing The Battery - Volvo XC90 Owner's Manual

Maintenance and service
Battery
Draining 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 evacu-
ation hose is connected to the new battery
and that it is routed to the outlet in the
bodywork.
NTM

Changing 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.
– Wait 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).
– Disconnect the negative lead first.
– Then disconnect the positive lead and the
evacuation hose for the oxyhydrogen.
Do as follows when installing the battery:
– Set the battery in place.
– Connect the positive lead first.
– Then connect the negative lead.
– Make sure the evacuation hose is
correctly connected to both the battery
and the outlet in the bodywork.