In addition to a heavy-duty start battery, models with Start/Stop also have a support battery that provides extra current during the Start/Stop function's start sequence.
The following table shows the specifications for the support battery:
| Current (V) | 12 |
| Cold start capacity (Cold Cranking Amperes - CCA) (A) | 170 |
| Dimensions, L×W×H in. (mm) | 5.9×3.5×5.1 (150×90×130) |
| Capacity (Ah) | 10 |
- When replacing the start battery or support battery in a vehicle with Start/Stop, an Absorbed Glass Mat (AGM) must be used.
- The greater the current consumption in the vehicle, the more the generator has to operate and the battery is charged. This increases fuel consumption.
- When the start battery's charge is below the minimum permitted level, the Start/Stop function will be disabled.
When the Start/Stop function is temporarily disabled due to high current consumption:
- The engine will auto-start, even if the brake pedal is depressed.
The support battery does not normally required more service than the start battery. If questions arise, consult a Volvo retailer or trained and qualified Volvo service technician.
Important
Note
If the start battery is completely discharged and the vehicle has no normal electrical functions, and the engine is then started using an auxiliary battery or battery charger, the Start/Stop function will be activated. The engine can then be auto-stopped but may not auto-start again due to an insufficient charge level in the start battery.
To help ensure auto-start, the start battery should be charged first. At a temperature of approx. 60 °F (15 °C), the battery should be charged for at least 1 hour, preferably using an external battery charger. At lower temperatures, the battery should be charged for 3–4 hours.
If a charger is not available, it is advisable to disable the Start/Stop function until the battery is sufficiently recharged.