A Volvo auxiliary battery is a secondary battery used alongside the vehicle’s main starter battery to supply power to the vehicle’s electrical systems and accessories.
Typical functions include:
Supports electrical systems when the engine is off or during engine start/stop operation.
Helps power accessories and control modules without excessively draining the main starter battery.
Provides additional electrical stability for sensitive electronic systems.
Commonly used in Volvo vehicles equipped with Start/Stop or higher electrical loads.
Depending on the Volvo model, the auxiliary battery may be an AGM (Absorbent Glass Mat) type.
Important: Volvo uses different auxiliary batteries depending on the model and year of manufacture.