What Size Battery Is in the 2010 Audi A6?

The 2010 Audi A6 typically uses a Group 49 (H8) or Group 94R (H7) 12‑volt AGM battery, with a capacity around 80–95 Ah and a cold-cranking amp (CCA) rating in the 720–850 CCA range, depending on engine and market. Below is a detailed breakdown of the common sizes, variations by engine, and what to look for when replacing the battery.

Contents

Standard Battery Specifications for the 2010 Audi A6
Differences by Engine and Trim
How to Identify the Correct Battery for Your A6
Why Battery Type and Coding Matter on the 2010 A6
Physical Location and Fit Considerations
Practical Advice for Owners Replacing the Battery
Summary

Standard Battery Specifications for the 2010 Audi A6

The 2010 Audi A6 is an electrically demanding, heavily computerized vehicle, so Audi specifies a relatively large, high-capacity battery mounted in the trunk. While exact specifications vary by engine and options, most models share broadly similar battery sizing and type.

Typical Battery Group Sizes

The following list outlines the most commonly specified battery group sizes for the 2010 Audi A6, focusing on physical fit and electrical capability.

Group 49 (H8) – Most common fitment in many 3.0T and higher‑spec models; large case, high capacity, high CCA.

Group 94R (H7) – Also common, especially on some 2.0T and 3.2 models; slightly smaller than Group 49 but still robust.

AGM type recommended – Absorbent Glass Mat batteries are typically specified for their durability and ability to handle high electrical loads.

For most owners, choosing a Group 49 (H8) or 94R (H7) battery that matches the original build and is an AGM design will satisfy the vehicle’s physical and electrical requirements.

Key Electrical Ratings

Beyond physical group size, the 2010 A6 relies on specific electrical performance parameters to ensure reliable starting and stable operation of its extensive electronics.

Nominal voltage: 12 V

Capacity: Typically around 80–95 Ah (ampere-hours), depending on engine and equipment level

Cold Cranking Amps (CCA): Commonly in the 720–850 CCA range

Reserve capacity: Often 130+ minutes (varies by brand and model)

Selecting a battery with capacity and CCA equal to or higher than the original specification helps maintain dependable cold-weather starts and support for comfort, safety, and infotainment systems.

Differences by Engine and Trim

Battery size and specification for the 2010 Audi A6 can vary slightly depending on engine, drivetrain, and options such as high-end audio or additional electrical equipment. While the case size is similar, capacity and CCA can differ.

Common 2010 A6 Configurations

The list below summarizes how battery specifications typically align with major engine variants of the 2010 A6 (C6 generation facelift), particularly in North American and European markets.

2.0 TFSI (where offered) – Often equipped with Group 94R (H7) AGM, around 80 Ah, 720–800 CCA.

3.2 FSI V6 – Usually Group 94R (H7) or Group 49 (H8) AGM, approximately 80–95 Ah, 720–850 CCA.

3.0 TFSI V6 (supercharged, “3.0T”) – Commonly Group 49 (H8) AGM, about 92–95 Ah, 800–850 CCA.

3.0 TDI / other diesel variants – Frequently the higher-capacity Group 49 (H8) AGM, typically around 95 Ah and higher CCA due to diesel starting demands.

While these configurations cover the majority of vehicles, equipment packages, regional variations, and dealer replacements mean the only definitive reference remains the battery label in your car or the original equipment (OE) specification from Audi.

How to Identify the Correct Battery for Your A6

Because individual cars may differ from general guidelines, verifying exactly what your A6 is built for is essential before buying a replacement battery.

Check the Existing Battery Label

Inspecting the battery already installed in your car is usually the quickest way to confirm its size and rating, provided it’s original or a correct replacement.

Look for the group/size code – Markings such as “H7,” “H8,” “94R,” or “49” are the key sizing indicators.

Note the Ah rating – Values like 80 Ah, 92 Ah, or 95 Ah are typically printed clearly on European‑spec or AGM batteries.

Confirm CCA – A number such as 720 A, 800 A, or similar will indicate cold-cranking capability.

Check battery type – The label should indicate AGM; if it does not, consider upgrading to AGM to align with Audi recommendations for this generation.

If your current battery deviates significantly from these norms, there is a chance it was a cost-focused replacement, and returning to an OE‑equivalent specification may improve reliability.

Consult the Owner’s Manual or Dealer

When the battery label is missing or clearly not original, factory documentation or dealer systems provide authoritative guidance on the specified battery.

Owner’s manual: Often lists the required battery capacity and type, though it may not always specify a group number.

Dealer parts department: Can look up the exact OE part number and specification using your VIN.

Professional catalog tools: Major battery brands maintain online or in-store fitment guides keyed to model year and engine.

Service records: Previous dealership invoices sometimes list the Audi battery part installed.

Using official or professional sources to cross-check your existing battery against factory requirements ensures you purchase a replacement that will fit, start reliably, and work correctly with the vehicle’s electrical system.

Why Battery Type and Coding Matter on the 2010 A6

The 2010 Audi A6’s electrical architecture is sophisticated, and certain models use battery energy management systems that assume specific battery characteristics. Installing the right size is only part of the equation; type and coding can affect performance and longevity.

Importance of AGM Technology

AGM batteries are usually recommended or specified on this generation of A6 due to their ability to handle repeated deep discharges and high accessory loads.

Higher durability: AGM better tolerates the demands of multiple control units, comfort features, and long standby times.

Reduced risk of leakage: Sealed design is well-suited to trunk mounting.

Improved performance in cold weather: Typically maintains higher voltage under heavy load in low temperatures.

Better recovery from partial discharge: Useful if the car is not driven frequently.

Although a conventional flooded battery may fit physically, using AGM is aligned with Audi’s design assumptions and helps avoid early failures or erratic electrical behavior.

Battery Registration/Coding (Where Applicable)

Some 2010 A6 models monitor and manage battery condition via the onboard electronics, adjusting charging strategy over time. When the battery is replaced, the system may require coding or “registration.”

Adaptation of charging profile: The car can optimize alternator behavior based on the new battery’s characteristics.

Accurate state-of-charge readings: Helps prevent overcharging or undercharging the new battery.

Use of diagnostic tools: Independent shops or owners often rely on VCDS (VAG‑COM) or similar to input the new battery’s details.

Not universal but advisable: Even if the car runs without coding, proper registration frequently improves long‑term reliability.

Coding requirements differ by specific control-unit software, but for any C6-generation Audi A6 with battery management functions, treating coding as part of the replacement process is a sound practice.

Physical Location and Fit Considerations

Beyond electrical specs, correct battery replacement also involves understanding where it sits in the vehicle and how it mounts, as this affects which group sizes will work without modification.

Battery Location and Mounting

The 2010 Audi A6 mounts its main battery in the trunk, which affects size, venting, and access requirements.

Trunk-mounted battery: Typically located beneath a trim panel in the right‑rear or central trunk floor area (depending on body style and market).

Hold‑down brackets: Designed for H7/H8‑style cases; an incorrect length or height can prevent secure mounting.

Vent port: Even AGM batteries use a vent connection when installed inside the passenger compartment or trunk.

Cable reach and polarity: Group 94R batteries have reversed terminals (the “R”) suitable for the A6’s cable layout.

Ensuring the new battery physically matches the OE layout—size, terminal orientation, and venting—removes the risk of loose installations, chafed cables, or damage from battery movement.

Practical Advice for Owners Replacing the Battery

Once you know the required size and type, a few practical steps help ensure a smooth replacement and avoid common pitfalls that can trigger warning lights or memory loss in control units.

Best Practices During Replacement

The following points outline how to approach replacing the battery on a 2010 Audi A6 to protect its sensitive electronics and preserve settings.

Use a memory saver if possible: A small external power supply can keep modules awake and preserve radio codes and settings.

Disconnect negative first, reconnect last: Standard safety practice to reduce risk of short circuits.

Handle trunk trim with care: The panels hiding the battery can be fragile and expensive to replace.

Check charging voltage after installation: With the engine running, voltage at the battery should typically be around 13.7–14.7 V.

Following careful procedures reduces the chance of unexpected electrical issues and supports the long service life of your new battery.

Summary

The 2010 Audi A6 generally uses a large, trunk‑mounted 12‑volt AGM battery, most commonly in Group 49 (H8) or Group 94R (H7) form, with a capacity around 80–95 Ah and a CCA rating in the 720–850 range, depending on engine and market. Variations exist between 2.0T, 3.2, 3.0T, and diesel models, but the overarching requirement is a high-capacity AGM battery matched to Audi’s specifications. For an accurate replacement, owners should confirm the exact group size, Ah rating, and CCA on the existing battery or via the owner’s manual or dealer records, and, where applicable, ensure the new battery is correctly registered or coded in the vehicle’s control system.

Is battery size 48 the same as H6?

Group 48 and H6 refer to the same standard car battery size, with “Group 48” being the BCI (Battery Council International) designation used in North America and “H6” being the European designation (also known as LN3). Therefore, they are not different; they are two different names for the same battery physical size and specification. A Group 48/H6 battery is common in many modern cars, SUVs, and light trucks and has specific dimensions, typically around 278×175×190278 cross 175 cross 190278×175×190 mm or 10.75×6.9×7.510.75 cross 6.9 cross 7.510.75×6.9×7.5 inches.
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Feature	Group 48 / H6
Alternative names	Group 48, H6, LN3, L3, 66L3
Common vehicle types	Modern cars, SUVs, light trucks
Typical dimensions	Approx.278×175×190278 cross 175 cross 190278×175×190 mm (or 10.75×6.9×7.510.75 cross 6.9 cross 7.510.75×6.9×7.5 inches)
Key characteristic	A standardized size that fits a wide range of vehicles
Technology	Can be lead-acid or AGM (Absorbent Glass Mat), with AGM being common in modern cars

What size battery is in the Audi A6?

The Audi A6 battery size can vary depending on the model year and specific vehicle options, with common sizes including Group 48 (H6), Group 49 (H8), Group 94R (H7), and Group 140R (H4). To find the correct size for your vehicle, it’s essential to check your car’s existing battery or use your vehicle’s VIN or specific PR codes to ensure a correct fit.

Group Size	Common Examples
Group 48 / H6	Battery with dimensions approximately 11″ L x 6-7/8″ W x 7-1/2″ H
Group 49 / H8	Larger battery, approximately 13-15/16″ L x 6-7/8″ W x 7-1/2″ H
Group 94R / H7	Battery with dimensions around 12.44″ L x 6.89″ W x 7.44″ H
Group 140R / H4	Another common fitment option

Verify with your vehicle: The most reliable method is to physically check the label on your current battery or consult your car’s manual.
Use a vehicle lookup tool: Many auto parts websites have a “find my parts” feature where you can enter your car’s year, make, and model, or even your VIN, to see compatible battery options.
Consult factory options: In some cases, a vehicle’s factory-installed options (denoted by PR codes) can influence the battery size, so it’s best to check these if possible.

What size battery is in the 2011 Audi A6?

Duralast Group Size 48 H6 Battery H6-DL.

How do I know my battery size?

You can check a battery’s size by looking for markings like mAh, Wh, or a BCI Group Size on the battery itself, in the device’s user manual, or by using online tools. For digital devices, you can often find the battery capacity in the device’s settings under an “About” or “Battery” section. For car batteries, the physical group size is printed on the battery’s label and is crucial for ensuring a correct fit in the car’s compartment.
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For portable electronics

Check the label: Look for markings like mAh (milliampere-hours) or Wh (watt-hours) printed on the battery itself.
Check the device settings: On many Android devices, you can find battery capacity in Settings > About phone > Battery or by searching for “battery information”.
Check the manual: The device’s user manual will list the battery capacity or type.

For car batteries

Check the battery label: Open the hood and look for the BCI Group Size printed on the label on top of the battery. This size is crucial for ensuring a physical fit in the car.
Check the owner’s manual: The owner’s manual will specify the correct BCI Group Size and other details like cold cranking amps (CCA).
Use online tools: Many auto parts stores offer online fitment finders where you can enter your car’s year, make, and model to find compatible batteries.
Measure it yourself: While less reliable than the BCI size, you can measure the length, width, and height of the battery itself and compare them to online charts to find a corresponding group size.

This video demonstrates how to test a car battery using a multimeter: 59sClassic Car MaintenanceYouTube · May 31, 2024