Volvo XC90: Support battery - MAINTENANCE AND SERVICEVolvo XC90: Support battery

Vehicles with the Start/Stop function are equipped with two batteries – a more powerful 12 V start battery and a support battery that provides stronger current during the function's start sequence.

Volvo XC90. Support battery

The 12 V support battery is located in a box next to the spring strut in the engine compartment.

Volvo XC90. Support battery

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.


High voltage may be dangerous if handled incorrectly. Do not touch anything on batteries 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 perform service on the 48 V battery – an authorized Volvo workshop is recommended.


  • 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 disengaged.

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 workshop ‒ an authorized Volvo workshop is recommended.


If the following is not observed, the Start/Stop function may temporarily stop working after connection of an external starter battery or battery charger:

  • The negative battery terminal of the vehicle's starter battery must never be used to connect an external starter battery or battery charger – only the vehicle's negative charging point should be used as a grounding point.


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 autostart of the engine will fail due to insufficient 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 advisable to charge the battery with an external battery charger.

Specifications for support battery

Volvo XC90. Support battery

Volvo XC90. Support battery

A According to EN standard.

B Cold Cranking Amperes.


If replacing the battery, make sure you replace it with a battery of the same size, cold start capacity and type as the original battery (see the decal on the battery).

Starter battery
The starter battery is used to start the electrical system and power the starter motor and other electrical equipment in the vehicle. The vehicle has a single-pole electrical system that uses the chassis ...

Battery symbols
There are warning symbols and information on the batteries. ...

See also:

Phone settings
When the phone is connected to the car, the following settings can be made: Tap Settings in the Top view. Tap Communication Phone and select settings: Ringtones - select a ring tone. Ring tones from the ...

Pregnant women
The use of a seat belt is recommended for pregnant women to lessen the chance of injury in an accident. When a seat belt is used, the lap belt portion should be placed as low and snugly as possible on ...

Description and Operation
Description Limitations Of The Navigation system GPS Signal Reception State As the GPS satellite frequency is received/transmitted in straight lines, reception may not work if hiding devices are placed ...