Does the Dodge Durango have two batteries?

Yes. In Durango models that use the 48-volt eTorque mild-hybrid system, there is a separate 48-volt battery pack in addition to the conventional 12-volt battery. Trims without eTorque generally rely on a single 12-volt battery.

The Durango’s battery setup hinges on whether the vehicle is equipped with the 48-volt mild-hybrid system. The 12-volt battery continues to power traditional starting and accessory loads, while the 48-volt pack supports the eTorque system’s hybrid functions. If your Durango lacks eTorque, you’ll typically find only the standard 12-volt battery handling the electrical needs.

How the two-battery setup works

For readers seeking a practical outline of what the two batteries do and why the system exists, here are the core points:

• The 12-volt battery powers conventional starting and standard electrical accessories when the engine is off or not delivering full electrical load.


• The 48-volt battery pack powers the eTorque mild-hybrid system, including the belt-driven starter generator, aiding torque and smoothing start-stop functionality.


• A DC-DC converter bridges the 48-volt and 12-volt systems, ensuring essential 12-volt loads remain stable while the 48-volt system handles hybrid functions.


• The dual-battery arrangement enables energy recovery and improved efficiency without converting the Durango to a full hybrid powertrain.

In practice, the two-battery setup means Dodge combines a traditional 12-volt electrical architecture with a separate 48-volt module to support hybrid features. This configuration is specifically associated with Durangos equipped with the eTorque system; non-hybrid models use only the 12-volt battery.

Which Durango models have two batteries?

Before listing specifics, it’s helpful to know that the presence of two batteries depends on whether the Durango uses the 48-volt eTorque mild-hybrid system. The following points summarize the typical arrangement across model years:

• Durango models equipped with the 48-volt eTorque mild-hybrid system typically include both a conventional 12-volt battery and a separate 48-volt battery pack.


• Durango trims without eTorque (non-hybrid) generally rely on a single 12-volt battery for starting and normal electrical functions.


• Engine choices and market variations can affect the exact configuration, especially if a trim level does not offer eTorque.

For precise confirmation of your specific vehicle, check the window sticker, owner's manual, or ask a dealer with your VIN. If you’re replacing batteries, knowing whether two systems exist helps ensure you source the correct 12-volt battery and the separate 48-volt pack infrastructure.

How to identify a Durango with eTorque

Look for indicators that the Durango uses the 48-volt mild-hybrid system: mentions of “eTorque” or “48V” in official documentation or on the engine bay label, and a dual-battery/dual-system setup described in the owner's materials. If in doubt, a dealer can verify using the Vehicle Identification Number (VIN) and year-spec details.

Summary

In short, the Dodge Durango can have two batteries when equipped with the 48-volt eTorque mild-hybrid system—a 12-volt battery for traditional loads plus a separate 48-volt pack for hybrid functions. If the vehicle does not have eTorque, it typically uses only a single 12-volt battery. Always verify with your VIN and model year to be sure of your specific powertrain configuration.

How much does it cost to replace an auxiliary battery?

The cost to replace an auxiliary battery can range from $40 to $800 or more, depending on whether you do it yourself or go to a professional, and the type of vehicle you drive. Expect to pay $150-$400 for a typical car at a dealership, while luxury or complex vehicles could cost $400-$800 or more due to specialized batteries and labor for system resets. DIY replacement will be cheaper, with battery costs ranging from about $40 to $150, but labor costs and tool requirements should be considered. 
DIY vs. professional replacement

• DIY: The cost is primarily for the battery itself, which can be anywhere from $40 to $140. You'll need to factor in the cost of tools and your time. 
• Professional: Expect to pay for both the battery and labor.
  • Standard vehicles: The total cost is typically between $150 and $400. 
  • Luxury or high-performance vehicles: Costs can range from $400 to $800 or more due to more expensive batteries and the extra labor needed for programming and system resets. 

Factors that influence cost

• Vehicle type: Luxury and high-performance vehicles often have more expensive batteries and require more complex procedures. 
• Battery type: The cost varies based on the type of battery. For example, a standard lead-acid battery will be cheaper than an AGM or lithium-ion battery. 
• Labor costs: These depend on the complexity of the job. Some vehicles require specialized tools and expertise for installation and programming. 
• Dealer vs. independent mechanic: Dealerships may have higher labor rates but are necessary for some vehicles to ensure systems are properly registered. 

How to save money

• Check your warranty: See if the replacement is covered under your vehicle's warranty or extended service plan. 
• Compare prices: Get quotes from multiple independent mechanics or auto parts stores to compare prices for both parts and labor. 
• DIY installation: If you are comfortable with car maintenance, a DIY replacement can significantly lower the cost, as you will only pay for the battery and any necessary tools. 

Where is the auxiliary battery located in a Dodge Durango?

The auxiliary battery on a Dodge Durango is typically located under the passenger seat, although some models may not have one or could have it in a different location. To access it, you'll need to lift the carpeted mat in the passenger footwell to reveal the battery compartment.
 
This video shows the location of the auxiliary battery and how to access it: 37sFire It Up GarageYouTube · Aug 21, 2025
Location and access

• Primary location: Under the front passenger seat. 
• How to access: Open the front passenger door and look in the footwell area. Lift the carpeted mat to reveal the battery compartment. For some models, you may need to move the seat forward and then lift the cover, or even unbolt and recline the seat to get full access to the compartment, as shown in this YouTube video. 
• Note: Some models may not have an auxiliary battery, so check your vehicle's specific documentation if you don't find one. You can also call a Dodge dealer with your VIN to confirm the battery configuration. 

Why your vehicle has one

• The auxiliary battery is used to power accessories and the start-stop system.
• It provides backup power and helps prevent electrical issues when the engine is stopped. 

What to do if you suspect an issue

• If you're having electrical problems, check both the main and auxiliary batteries for a proper charge. 
• Ensure that both battery terminals are clean and have secure connections. 
• Note that some models with a start-stop system require both batteries to be replaced at the same time. 

You can watch this video to see how to replace the battery in a Dodge Durango: 1mAll About Cars - BasicsYouTube · Jul 12, 2025

What happens if the auxiliary battery dies?

If your car's auxiliary battery dies, you may experience electrical problems, such as the start/stop function failing, the car having trouble starting, or other electrical components like the infotainment system acting erratically. In some cases, a dead auxiliary battery can eventually drain the main battery, leaving the car unable to start. 
Common consequences of a dead auxiliary battery:

• Start/Stop system failure: The auxiliary battery is often responsible for the start/stop feature. If it dies, this function will stop working. 
• Starting issues: A dying auxiliary battery may not be able to provide the boost needed for a smooth start, leading to a slow or difficult start from the main battery. 
• Electrical component malfunctions: You may notice problems with your car's audio system, lights, infotainment screens, or other electronics that draw power from the auxiliary battery. 
• Warning lights: A "Auxiliary Battery Malfunction" warning light or a diagnostic trouble code like 9062 can appear on the dashboard. 
• Main battery drain: A failing auxiliary battery can put a significant strain on the main battery, causing it to drain prematurely and eventually fail as well. 

What to do

• Get it diagnosed: A mechanic can test the auxiliary battery and determine if it needs replacement. 
• Replace the battery: It's often best to replace the auxiliary battery to prevent further damage to the main battery and restore full electrical functionality. 
• Jump-start carefully: If you need to jump-start a car with a dead auxiliary battery, you may need to charge both the main and auxiliary batteries simultaneously, as some systems require both to be charged to start. 

Does a durango have two batteries?

Which Dodge Durango requires two batteries? Durangos with start-stop engines from model years 2017-2021 require an auxiliary battery, the MTX-AUX14. Why two? The Dodge Durango requires a lot of onboard power, and the auxiliary battery supports the main battery between engine starts.