Where is the second battery on a Dodge Durango?

The second battery on a Dodge Durango is located in the engine compartment, typically on the passenger side. This additional battery is part of the vehicle's dual-battery system, which provides extra power and reliability for the Durango's electrical components.

Understanding the Dual-Battery System in the Dodge Durango

The Dodge Durango, like many modern vehicles, is equipped with a dual-battery system. This system consists of two separate batteries that work together to power the vehicle's electrical systems. The primary battery is responsible for starting the engine, while the secondary battery provides additional power for accessories and other electrical components.

The secondary battery in the Durango is typically located in the engine compartment, on the passenger side of the vehicle. This placement allows for easy access and maintenance, as the battery is situated in a convenient location for service and replacement.

Benefits of a Dual-Battery System

The dual-battery system in the Dodge Durango offers several benefits, including:

• Increased Power Capacity: The secondary battery provides additional power, allowing the Durango to support more electrical accessories and components without draining the primary battery.


• Improved Reliability: If the primary battery fails or becomes discharged, the secondary battery can be used to start the vehicle, ensuring you can still get where you need to go.


• Enhanced Electrical System Redundancy: The dual-battery setup provides a backup power source, reducing the risk of electrical system failures and ensuring the Durango's various systems remain operational.

By understanding the location and purpose of the second battery in the Dodge Durango, owners can better maintain and care for their vehicle's electrical system, ensuring optimal performance and reliability.

Where is the battery located on a Dodge Durango?

The Dodge Durango's battery is located under the front passenger seat on most models, accessed by sliding the seat forward and lifting a panel. Some V6 models may have an additional auxiliary battery for the start-stop system, also found under the passenger seat. In a few specific model years or configurations (like the V8), the main battery may be located under the hood.
 
This video shows how to access the battery under the passenger seat: 44sFire It Up GarageYouTube · Aug 21, 2025
Detailed location and access

• Primary battery: Located under the front passenger seat. 
  • To access: Slide the front passenger seat all the way forward to make room to work underneath. You can access the battery and its cover through the passenger door or, in some cases, the rear passenger door. 
  • Accessing the battery: Lift the carpet or panel to reveal the battery. It will be secured by a hold-down bracket and may have a vent hose connected. 
• Auxiliary battery (on some V6 models):
  • This secondary battery is for the start-stop system and is also located under the passenger seat, often near the main battery. 
  • V8 models typically do not have this auxiliary battery. 
• Under the hood:
  • Some models, particularly certain V8 and newer configurations, have the battery located under the hood, often on the driver's side. 

This video shows the location of the battery in the trunk for some models: 42sElectrical Car Repair LIVEYouTube · Nov 2, 2024
Important tips

• Confirm your model: If you are unsure about your specific model's battery location, check the owner's manual or contact a Dodge dealer with your VIN to be certain. 
• Disconnect order: When disconnecting, always remove the negative cable first, followed by the positive. When reconnecting, attach the positive cable first. 

Does the Dodge Durango have two batteries?

Yes, many Dodge Durangos have two batteries, but it depends on the model year and engine. Durangos equipped with the start-stop system have a primary battery and a smaller auxiliary battery to support the system and other electrical functions. Models with the start-stop system typically have the second battery under the front passenger seat. 
How the two batteries work

• Primary battery: This is the main battery that provides the power to start the engine. 
• Auxiliary battery: This smaller battery is specifically for the start-stop function. When the engine shuts off at a stop, the auxiliary battery powers the vehicle's electronics, and then it helps restart the engine when you press the accelerator. 

Which models have two batteries

• V6 models: Models with the V6 engine are more likely to have the start-stop system and the second battery. 
• HEMI models: HEMI engine models are generally not equipped with the start-stop system and therefore only have one battery, according to some users. 

Important considerations

• If your Durango has two batteries, you should replace both at the same time, as a weak auxiliary battery can damage the main battery. 
• If you are experiencing electrical issues, check both batteries for proper voltage and clean terminals. 

Where is the auxiliary battery located in a Dodge Durango?

To access it, open the passenger door, and look in the footwell area. Lift the carpet to find the auxiliary battery beneath it.

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.