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.

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.

• Never use a 48 V auxiliary battery to 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 normally requires no more maintenance than the starter battery. If you have any questions or concerns, consult a workshop. An authorized Volvo workshop is recommended.

Specifications for Support Battery

^A In accordance with EN standard.

^B Cold cranking amps.