Volvo S90 2019 Owner's Manual page 623

Support battery
Cars with Start/Stop function, in addition to the
starter battery, are equipped with a support bat-
tery.
Cars with the Start/Stop function are equipped
with two 12 V batteries - one extra powerful
starter battery for starting and one support bat-
tery that helps during the Start/Stop function's
starting sequence.
The support battery is located in a box next to the strut
tower.
Automatic starting can only take place if the gear lever is in neutral position.
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NOTE
The higher the current take-off in the car,
•
the more the alternator must be working
and the batteries charging = Increased
fuel consumption.
When the capacity of the starter battery
•
has fallen below the lowest permissible
level then the Start/Stop function is dis-
engaged.
Temporarily reduced Start/Stop function due to
high current take-off means:
The engine starts automatically
•
driver depressing the clutch pedal (manual
gearbox).
The engine starts automatically without the
•
driver lifting his/her foot off the foot brake
pedal (automatic gearbox).
The support battery normally requires no more
service than the normal starter battery. A work-
shop should be contacted in the event of ques-
tions or problems - an authorised Volvo workshop
is recommended.
IMPORTANT
If the following instruction is not observed
then the Start/Stop function may temporarily
cease to work after the connection of an
external starter battery or battery charger:
The negative battery terminal on the car's
•
starter battery must never be used for
connecting an external starter battery or
battery charger - only the car's negative
charging point may be used as the
grounding point.
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without the
MAINTENANCE AND SERVICE
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