The auxiliary battery in the Volvo S60 supports electrical systems and is crucial for functions like stop-start technology. It’s essential to monitor its health and replace it when necessary for optimal performance.
The auxiliary battery in your Volvo S60 plays a vital role in the vehicle’s electrical system. Unlike the primary battery, which starts the engine, the auxiliary battery powers accessories and features that enhance your driving experience.
This guide offers practical insights for Volvo S60 owners on understanding, maintaining, and replacing the auxiliary battery.
- The auxiliary battery in the Volvo S60 is essential for powering electrical systems.
- Regularly check the battery’s health to avoid performance issues.
- Replacement procedures vary by model year and trim.
- Be aware of symptoms indicating a failing auxiliary battery.
- Proper maintenance can extend the lifespan of your auxiliary battery.
What Is the Auxiliary Battery in a Volvo S60?
The auxiliary battery in a Volvo S60 is a smaller battery designed to support various electrical systems, including stop-start technology, infotainment, and other electronic components. While the main battery is responsible for starting the engine, the auxiliary battery helps manage the vehicle’s power needs, especially during stop-and-go driving.

Common Symptoms of a Failing Auxiliary Battery
Recognizing the signs of a failing auxiliary battery can save you from unexpected breakdowns. Here are some common symptoms:
Electrical System Malfunctions
If you notice flickering lights, malfunctioning infotainment systems, or erratic behavior of electronic features, the auxiliary battery may be failing.
Increased Engine Start-Stop Frequency
In models equipped with stop-start technology, a malfunctioning auxiliary battery can lead to more frequent engine restarts, which may affect overall fuel efficiency.
Warning Messages
Keep an eye out for warning messages on the dashboard that indicate battery issues. These alerts are crucial for timely maintenance.
How to Check the Health of Your Auxiliary Battery
Regular checks can help you determine the health of your auxiliary battery. Here are steps you can take:

Visual Inspection
Open the hood and visually inspect the battery for any signs of corrosion, leaks, or physical damage. Corrosion on the terminals can indicate a problem.
Voltage Test
Using a multimeter, check the voltage of the auxiliary battery. A healthy battery should show a voltage between 12.4 to 12.7 volts when not under load. Anything lower may indicate that the battery needs charging or replacement.
For related context, you may also want to read Volvo S60 key fob battery replacement.
Load Testing
If you have access to a battery load tester, perform a load test. This will provide a more accurate assessment of the battery’s ability to hold a charge under operational conditions.
Replacing the Auxiliary Battery in a Volvo S60
When it comes time to replace your auxiliary battery, following proper procedures is essential. Here’s a step-by-step guide:
Gather Necessary Tools
You’ll need basic tools such as a socket wrench, a multimeter, and safety gloves. Ensure you have a compatible replacement battery on hand.
Locate the Auxiliary Battery
In most Volvo S60 models, the auxiliary battery is located in the trunk or under the rear seat. Refer to your owner’s manual for exact placement.
Disconnect the Battery
Before removing the old battery, ensure the vehicle is turned off. Disconnect the negative terminal first, followed by the positive terminal to prevent any electrical shorts.
Remove and Replace
Carefully remove the old battery from its compartment. Place the new battery in the same position, reconnecting the positive terminal first, followed by the negative terminal. Ensure all connections are secure.
Test the New Battery
Once installed, test the new auxiliary battery with a multimeter to ensure proper voltage and functionality.
Recommended Replacement Options for the Volvo S60 Auxiliary Battery
Choosing the right replacement battery is crucial for optimal performance. Here are some recommendations:
OEM Vs. Aftermarket Batteries
Opting for an Original Equipment Manufacturer (OEM) battery ensures compatibility and reliability. However, high-quality aftermarket batteries can also serve as excellent alternatives if they meet the required specifications.
Suggested Brands
Some reputable brands for auxiliary batteries compatible with the Volvo S60 include:
- VARTA
- Exide
- ACDelco
- Optima
Maintenance Tips for Prolonging Auxiliary Battery Life
Proper maintenance can extend the lifespan of your auxiliary battery and ensure consistent performance. Here are some practical tips:
Regular Checks
Perform regular inspections and voltage checks every few months. This will help you catch potential issues early.
Keep Terminals Clean
Ensure the battery terminals are clean and free from corrosion. Use a mixture of baking soda and water to clean if necessary, but remember to wear gloves.
Minimize Power Drain
Limit the use of electrical accessories when the engine is off. This helps prevent the auxiliary battery from draining excessively.
🔧 Practical Tip: Always dispose of old batteries responsibly by taking them to a recycling center or a local auto parts store that offers battery recycling services.
Frequently Asked Questions
How Often Should I Replace the Auxiliary Battery in My Volvo S60?
Typically, auxiliary batteries last around 3 to 5 years, depending on usage and environmental conditions. Regular checks can help determine the need for replacement.
Can I Replace the Auxiliary Battery Myself?
Yes, replacing the auxiliary battery is a relatively straightforward process that most owners can handle with basic tools and precautions.
What Happens If I Ignore a Failing Auxiliary Battery?
Ignoring a failing auxiliary battery can lead to electrical system malfunctions, reduced fuel efficiency, and even a complete failure of vital electronic components.
Where Can I Find the Best Replacement Battery for My Volvo S60?
Reputable auto parts stores or online retailers specializing in automotive batteries typically offer a range of options for replacement batteries.
Is the Auxiliary Battery Covered Under Warranty?
Warranty coverage may depend on the specific terms of your vehicle’s warranty. Check your manual or consult with your dealer for details.
💡 Evans Torres Tip: Always keep your auxiliary battery’s specifications handy. This ensures you can quickly find a compatible replacement when it’s time for a change.
Final Verdict
The auxiliary battery in your Volvo S60 is essential for maintaining the performance of various electrical systems. Regular checks, timely replacements, and proper maintenance can significantly enhance its lifespan. By staying proactive, you can avoid common issues and ensure that your vehicle operates smoothly.
Author

Evans Torres
I’m Evans Torres, an automotive engineer who loves Volvo cars. I graduated in Automotive Engineering from USC. I have worked in the car industry for years and now share my knowledge on The Volvo Life. I started this blog to connect with other Volvo fans. I offer tips, news, and advice to help you care for your car. My goal is to help you keep your Volvo in great shape and find all the best things about it. Join me as we discover everything Volvo has to offer!