If you’ve ever wondered about the battery setup in your Jeep Compass, you might be surprised to learn that it’s not as straightforward as in most vehicles. Unlike conventional cars with a single battery, the Jeep Compass actually has two batteries working together to power different systems. This dual-battery configuration can sometimes cause confusion, especially when troubleshooting electrical issues or planning for replacement.
The Dual Battery System in Jeep Compass
The Jeep Compass is equipped with two batteries: a primary 12V battery and a smaller auxiliary battery. This setup is particularly common in models with the automatic start-stop feature, which helps improve fuel efficiency by temporarily shutting off the engine when the vehicle is stationary.
Primary 12V Battery
The main battery in your Jeep Compass is a standard 12V battery responsible for starting the engine and powering most of the vehicle’s electrical systems. It’s located in the engine compartment and is similar to what you’d find in most vehicles.
Auxiliary Battery
The secondary or auxiliary battery is smaller and primarily supports the start-stop system and various electronic components. It’s positioned near the main battery but is often overlooked during routine maintenance.
Where Are the Batteries Located in a Jeep Compass?
Main Battery Location
The primary battery in your Jeep Compass is located in the engine compartment, typically on the driver’s side. It’s secured with a hold-down bracket and has standard positive and negative terminals.
To access this battery, you’ll need to open the hood and locate it near the front of the engine bay. It’s usually the larger of the two batteries and is connected to the vehicle’s starting system.
Auxiliary Battery Location
The auxiliary battery is also located in the engine compartment, usually positioned right in front of the main battery. It’s smaller in size but equally important for the proper functioning of your vehicle.
Many Jeep Compass owners overlook this battery during maintenance, which can lead to unexpected electrical issues. The auxiliary battery is connected to the main battery through a Power Control Relay (PCR).
Battery Types and Specifications for Jeep Compass
Main Battery Specifications
The primary battery in a Jeep Compass typically requires a Group 94R or similar battery with a capacity of around 800-850 Cold Cranking Amps (CCA). The exact specifications may vary slightly depending on your model year and trim level.
| Battery Type | CCA Rating | Voltage | Group Size | Typical Lifespan |
| Standard Lead-Acid | 800-850 | 12V | 94R | 3-5 years |
| AGM (Absorbent Glass Mat) | 850-950 | 12V | 94R | 4-7 years |
Auxiliary Battery Specifications
The auxiliary battery is typically an AGM (Absorbent Glass Mat) type with the designation “AUX 14” and approximately 200 CCA. This smaller battery is specifically designed to support the start-stop system and other electronic components.
Recommended Battery Brands for Jeep Compass
When it comes time to replace either battery in your Jeep Compass, choosing a high-quality brand can make a significant difference in performance and longevity. Here are some of the most reliable battery brands recommended for Jeep Compass vehicles:
Interstate Batteries
Known for their reliability and longevity, Interstate batteries are a popular choice for Jeep Compass owners. They offer excellent cold-weather performance and come with good warranty coverage.
DieHard
DieHard batteries have a strong reputation for durability and consistent performance. Their advanced models are particularly well-suited for vehicles with start-stop technology like the Jeep Compass.
ACDelco
As the OEM supplier for many vehicles, ACDelco offers batteries that meet or exceed the original specifications for your Jeep Compass, ensuring optimal compatibility and performance.
Other reliable brands include Optima, Duralast, and NAPA. When selecting a battery, always verify compatibility with your specific Jeep Compass model year and ensure it meets the required specifications for both the main and auxiliary batteries.
Battery Replacement and Lifespan
How Long Do Jeep Compass Batteries Last?
The batteries in a Jeep Compass typically last between 3-5 years for the main battery and 2-4 years for the auxiliary battery. However, several factors can affect battery lifespan, including:
- Climate conditions (extreme heat or cold)
- Driving habits and frequency
- Use of the start-stop feature
- Electrical system health
- Maintenance practices
DIY Replacement vs. Professional Service
Replacing the main battery in a Jeep Compass is a relatively straightforward DIY task if you have basic tools and mechanical knowledge. However, replacing the auxiliary battery can be more complex due to its location and the need to properly reset the vehicle’s computer systems.
DIY Replacement Pros
- Cost savings on labor
- Convenience of doing it on your schedule
- Learning opportunity
DIY Replacement Cons
- Risk of improper installation
- Potential for electrical system issues
- No warranty on labor
Ready to Replace Your Batteries?
Get the right tools and parts for a successful DIY battery replacement in your Jeep Compass.
Maintaining Your Jeep Compass Batteries
Proper maintenance can significantly extend the life of both batteries in your Jeep Compass. Here are some essential maintenance tips:
Regular Inspection
- Check both batteries for corrosion on terminals and cables
- Ensure all connections are tight and secure
- Look for any physical damage or leakage
- Verify that the battery hold-down brackets are properly secured
Cleaning and Protection
- Clean terminals with a battery cleaning solution and wire brush
- Apply terminal protectant to prevent future corrosion
- Keep the battery surface clean to prevent discharge
- Protect batteries from extreme temperature fluctuations when possible
Testing Battery Health
Regularly testing your batteries can help you identify potential issues before they lead to a complete failure. Most auto parts stores offer free battery testing, or you can purchase a multimeter to check the voltage yourself.
A healthy main battery should read between 12.4-12.7 volts when the engine is off and 13.7-14.7 volts when the engine is running. The auxiliary battery should maintain similar voltage levels.
Keep Your Batteries in Top Condition
Get the right tools and products to maintain your Jeep Compass batteries and extend their lifespan.
Signs of Battery Failure in Jeep Compass
Recognizing the early signs of battery failure can help you address issues before they leave you stranded. Here are the common symptoms to watch for in your Jeep Compass:
Main Battery Failure Signs
- Slow engine cranking when starting
- Dimming headlights and interior lights
- Battery warning light on the dashboard
- Electrical components functioning erratically
- Clicking sound when turning the key
- Need for frequent jump starts
Auxiliary Battery Failure Signs
- Start-stop system not functioning properly
- Start-stop warning light illuminated
- Issues with remote keyless entry
- Problems with electronic features when the engine is off
- Vehicle beeping periodically without apparent reason
If your Jeep Compass displays multiple warning lights simultaneously or you experience electrical issues that persist after replacing the main battery, the auxiliary battery may be the culprit. Both batteries often need to be replaced as a pair for optimal performance.
Special Considerations for Jeep Compass Batteries
The Power Control Relay (PCR)
The Jeep Compass uses a Power Control Relay (PCR) to manage the connection between the main and auxiliary batteries. This relay allows the alternator to charge the auxiliary battery when needed and isolates it at other times. Issues with this relay can cause problems with both batteries.
Memory Saver Considerations
When replacing either battery in your Jeep Compass, it’s recommended to use a memory saver device to prevent the loss of electronic settings and to avoid potential computer system issues. This is particularly important for newer models with more sophisticated electronics.
Climate Considerations
If you live in an area with extreme temperatures, consider using batteries specifically designed for your climate. Cold-weather regions benefit from higher CCA ratings, while hot climates may require batteries with better heat resistance.
“When replacing the auxiliary battery in a Jeep Compass with auto start-stop technology, it’s crucial to use the correct AGM battery type. Using a standard lead-acid battery can cause system malfunctions and potentially damage electronic components.”
Frequently Asked Questions About Jeep Compass Batteries
How many batteries does a Jeep Compass have?
A Jeep Compass has two batteries: a main 12V battery for starting the engine and powering most electrical systems, and a smaller auxiliary battery that primarily supports the start-stop system and various electronic components.
How much does it cost to replace Jeep Compass batteries?
The cost to replace both batteries in a Jeep Compass typically ranges from 0-0 for parts alone, depending on battery quality and where you purchase them. Professional installation may add another -0 to the total cost. DIY replacement can save on labor costs.
Do I need to replace both batteries at the same time?
While not absolutely required, it’s generally recommended to replace both the main and auxiliary batteries at the same time. This ensures balanced performance and prevents a situation where a new battery is being strained by working with an older, degraded battery.
What happens if the auxiliary battery fails?
If the auxiliary battery fails, you may experience issues with the start-stop system, remote keyless entry problems, and various electronic malfunctions. In some cases, the vehicle may still start and run using the main battery, but certain features may be limited or unavailable.
Can I disable the start-stop system to extend battery life?
Yes, most Jeep Compass models allow you to temporarily disable the start-stop system by pressing a button on the dashboard. However, this setting typically resets each time you restart the vehicle. Some aftermarket devices can permanently disable this feature, but this may affect fuel economy and emissions.
Conclusion: Keeping Your Jeep Compass Powered
Understanding that your Jeep Compass has two batteries—a main battery and an auxiliary battery—is crucial for proper maintenance and troubleshooting. Both batteries work together to power different systems in your vehicle, with the main battery handling engine starting and most electrical needs, while the auxiliary battery supports the start-stop system and various electronic components.
Regular maintenance, timely replacement, and using high-quality batteries appropriate for your specific model can help ensure reliable performance and prevent unexpected breakdowns. Remember that issues with either battery can affect the overall functionality of your vehicle, so it’s important to monitor both and address any signs of failure promptly.
Whether you choose to handle battery maintenance and replacement yourself or rely on professional service, staying informed about your Jeep Compass’s dual-battery system will help you make better decisions and keep your vehicle running smoothly for years to come.
Ready to Upgrade Your Jeep Compass Batteries?
Find the perfect batteries for your vehicle and ensure optimal performance in all conditions.
