Volvo XC90 Owner's Manual page 601

Support battery
Vehicles with the Start/Stop function are
equipped with two batteries – a more power-
ful 12 V start battery and a support battery
that provides stronger current during the
function's start sequence.
The 12 V support battery is located in a box next to
the spring strut in the engine compartment.
If the vehicle is instead equipped with a 48 V support
battery, it is located under the cargo compartment.
The box over the 48 V support battery may only be
removed by an authorized workshop.
WARNING
High voltage may be dangerous if handled
incorrectly. Do not touch anything on bat-
teries that is not clearly described in this
Owner's Manual.
Never use a 48 V support battery to
•
jump start the vehicle.
External electrical equipment may not
•
under any circumstance be connected
to the 48 V battery.
Only a workshop may replace or per-
•
form service on the 48 V battery – an
authorized Volvo workshop is recom-
mended.
MAINTENANCE AND SERVICE
NOTE
The higher the current consumption in
•
the vehicle, the more the alternator has
to work and the batteries have to be
charged = increased fuel consumption.
When the starter battery capacity has
•
dropped below the lowest permissible
level, the Start/Stop function is disen-
gaged.
When the Start/Stop function is temporarily
reduced due to high current consumption:
The engine will auto-start, even if the
•
driver does not lift their foot from the
brake pedal.
The support battery does not normally require
more service than the start battery. If you have
any questions or concerns, consult a work-
shop ‒ an authorized Volvo workshop is rec-
ommended.
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