Volvo XC40 2019 Owner's Manual page 402

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STARTING AND DRIVING
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Related information
Refilling coolant (p. 549)
Driving with a trailer (p. 404)
Preparing for a long trip (p. 393)
400
Battery drain
The electrical functions in the vehicle drain
the battery to varying degrees. Avoid using
ignition mode II when the engine is switched
off. Use ignition mode I instead, as this uses
less electrical current.
Note that certain accessories may also drain
power from the electrical system. Do not use
functions that use a lot of electrical current
when the engine is turned off. Examples of
such functions are:
blower
headlights
windshield wipers
audio system (especially at high volume).
If the starter battery voltage is low, a message
is shown in the driver display. The vehicle's
energy-saving function will then turn off or
reduce certain functions, such as the blower
and/or the audio system.
To charge the battery, start the engine and
let it run for at least 15 minutes (driving
charges the battery faster than letting the
engine idle).
Related information
Starter battery (p. 551)
Ignition modes (p. 362)
Jump starting using another
battery
If the start battery is discharged, current from
another battery can be used to start the vehi-
cle.
Jumper cable connecting points.
To avoid short circuits or other damage, the
following steps are recommended when jump
starting the battery using another battery:
1.
Put the ignition in mode 0.
2. Make sure the auxiliary battery (the bat-
tery used to jump start the discharged
battery) has a voltage of 12 volts.
3. If the auxiliary battery is in another vehicle,
turn off that vehicle's engine and make
sure that the vehicles are not touching
each other.

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