Volvo XC40 2021 Owner's Manual page 414

STARTING AND DRIVING
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WARNING
Batteries generate hydrogen gas,
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which is flammable and explosive.
Do not connect the jumper cable to
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any part of the fuel system or to any
moving parts. Avoid touching hot
manifolds.
Battery fluid contains sulfuric acid. Do
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not allow battery fluid to contact eyes,
skin, fabrics or painted surfaces.
If contact occurs, flush the affected
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area immediately with water. Obtain
medical help immediately if eyes are
affected.
Never expose the battery to open flame
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or electric spark. Do not smoke near
the battery. Failure to follow the
instructions for jump starting can lead
to injury.
412
NOTE
If the starter battery has been discharged
to the extent that the vehicle does not have
normal electrical functions and the engine
must then be jump-started with an external
battery or a battery charger, the Start/Stop
function may remain activated. If the Start/
Stop function shortly thereafter auto-stops
the engine, there is a huge risk that auto-
start of the engine will fail due to insuffi-
cient battery capacity since the battery had
not had time to recharge.
If the vehicle has been jump-started or if
there has not been enough time for the
battery to be charged with a battery
charger, the Start/Stop function should be
temporarily deactivated until the battery
has been recharged by the vehicle. At an
ambient temperature of about +15°C
(about 60°F), the battery must be charged
by the vehicle for at least one hour. At
lower ambient temperatures, the charging
time can increase to 3-4 hours. It is advisa-
ble to charge the battery with an external
battery charger.
Related information
Starting the vehicle (p. 370)
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Ignition modes (p. 372)
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Adjusting the steering wheel (p. 187)
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Selecting ignition mode (p. 374)
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Support battery (p. 567)
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