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Your vehicle is equipped with 2 types of batteries: Auxiliary (for start/stop and other systems) and Primary (for starting).
These batteries are designed to run as a backup to the starting battery and provide power to some essential equipment like engine start/stop and other systems that require power while the engine is off to put less strain on the main battery and alternator.
If you can't find or no longer have your car's owner's manual to look up the location of the batteries, you could also get your hands a little dirty and look in the car. Auxiliary batteries are not always as easy to find as your main starting battery. It could certainly be under the hood but it could also be under a seat, behind the glovebox or somewhere in the trunk.
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What Our Experts Are Saying
With high cold cranking amps, this battery delivers serious starting power. The Duracell Ultra Gold Car Battery Group 34 | 800CCA delivers strong cranking power and trusted durability—ideal for year-round reliability in your car, truck, or SUV.
Fits Your 2009 Bentley Arnage
Fits as Auxiliary Battery
What Our Experts Are Saying
Starts up strong, keeps going strong. The Duracell Ultra Car Battery Group 34 | 700CCA provides reliable starting power and trusted performance in all weather—perfect for cars and trucks with everyday driving needs.
Fits Your 2009 Bentley Arnage
Fits as Auxiliary Battery
Longer Lasting
What Our Experts Are Saying
Need something reliable? The Duracell Platinum AGM Car Battery Group 34 | 750CCA delivers advanced absorbed glass mat performance, strong cranking power, and deep cycling durability—perfect for today’s electronics-heavy vehicles.
Fits Your 2009 Bentley Arnage
Fits as Auxiliary Battery
What Our Experts Are Saying
You’ll notice the high cold cranking amps the second you start it up. The Duracell Ultra Gold Car Battery Group 34/78 | 800CCA is a high-performance Car Battery built for reliable starts, dual terminal flexibility, and long-lasting power in tough conditions.
Fits Your 2009 Bentley Arnage
High Performance
What Our Experts Are Saying
Trust us, this one delivers. If your car keeps giving you trouble starting, the Optima Red Top is worth it. It’s got high cold cranking amps, so it fires up even in the cold. Plus, it’s maintenance-free — just drop it in and forget about it.
Fits Your 2009 Bentley Arnage
Fits as Auxiliary Battery
Fits Your 2009 Bentley Arnage
Fits as Auxiliary Battery
High Performance
What Our Experts Are Saying
Maximize your startup power with the ability to connect additional accessories with the dual terminals. X2Power’s industry-leading Peak Cranking Amps (PCA) and high Reserve Capacity provide the ultimate power to handle the heaviest demands.
Fits Your 2009 Bentley Arnage
High Performance
What Our Experts Are Saying
Your battery faces its toughest challenge in the first 5 seconds of ignition. X2Power Ultimate AGM batteries feature premium Peak Cranking Amps (PCA), ensuring your high-tech vehicle gets the elite, high-end energy force it takes to start.
Fits Your 2009 Bentley Arnage
Fits as Auxiliary Battery
What Our Experts Are Saying
Starts up strong, keeps going strong. Upgrade to lasting power with the Duracell Ultra Gold Group 91 flooded car battery. Delivering 700 CCA, it provides reliable year-round starting strength backed by America’s most trusted battery brand.
Fits Your 2009 Bentley Arnage
Fits as Primary Battery
Fits Your 2009 Bentley Arnage
Fits Your 2009 Bentley Arnage
High Performance
What Our Experts Are Saying
You’ll notice the high cold cranking amps the second you start it up. Get powerful, reliable starts every time with the Optima Red Top 800CCA AGM car battery, built for group size 34/78 vehicles with dual terminals and rugged SPIRALCELL technology.
Fits Your 2009 Bentley Arnage