Auxiliary Battery

The auxiliary battery stores electrical energy to power vehicle accessories, comfort systems, and electronics independently of the main starting battery, reducing strain on the primary battery and ensuring consistent power availability to critical systems

An auxiliary battery is a second battery found in many modern vehicles, particularly those with start-stop technology, hybrid powertrains, or advanced electrical systems. It supplements the main engine battery by powering accessories, infotainment systems, and other components during engine shutdown or when additional electrical demand exceeds the main battery's capacity. This helps preserve the primary battery's charge for engine starting.

⚠️ Owners Often Notice

If the Auxiliary Battery is starting to fail, these are the signs owners most commonly report before it gets worse:

Related Services

Services commonly performed on or around this part.