What Size Battery Is in the 2011 Audi S5?

The 2011 Audi S5 commonly uses a Group 48 (H6) or Group 49 (H8) 12-volt AGM battery, with a typical capacity around 70–95 Ah and cold cranking amps (CCA) in the 650–850 range, depending on engine configuration and market. This article explains the standard battery specifications, variations by model and region, and what to consider when replacing the battery.

Understanding the 2011 Audi S5 Battery Specification

The 2011 Audi S5 is an electrically demanding vehicle by early-2010s standards, with features like sophisticated infotainment, numerous control modules and, in many cases, start–stop–ready charging systems in some markets. For that reason, Audi equips it with a relatively large absorbed glass mat (AGM) battery to ensure reliable starts and stable voltage under heavy accessory load.

Typical OEM Battery Group and Type

While exact factory fitment can vary by market and production date, most 2011 Audi S5 models use one of two physical battery sizes that conform to European DIN/H-size and North American BCI group standards:

The following list outlines the most common original and direct-fit replacement battery sizes for the 2011 Audi S5 and what they mean in practical terms.

• Group 48 / H6 AGM – Approx. 70–80 Ah capacity, often around 730–760 CCA. This is a frequent factory or service replacement size for many S5 coupes and cabriolets.
• Group 49 / H8 AGM – Larger physical size, typically 90–95 Ah capacity and 800–850+ CCA. Used in some higher‑load configurations, cold‑climate packages, or where extra reserve capacity is desired.
• AGM (Absorbed Glass Mat) chemistry – Preferred over conventional flooded lead–acid due to better vibration resistance, deeper cycling capability and compatibility with Audi’s charging strategy.
• 12‑volt nominal system – Standard automotive voltage, integrated with the S5’s alternator and control modules.

In practice, either Group 48/H6 or Group 49/H8 AGM batteries are considered correct fitments, with Group 48 being more common and Group 49 offering extra capacity where it physically fits in the battery tray and meets clamp/hold‑down requirements.

Engine, Body Style and Market Variations

The 2011 Audi S5 was offered with different engines and configurations depending on market, which can slightly influence the chosen battery capacity, though the physical group size usually remains within the H6/H8 range.

Coupe vs. Cabriolet and Engine Differences

The S5 range in that model year included both a coupe and a cabriolet, and two main engines: the naturally aspirated 4.2‑liter V8 (primarily in the coupe) and the 3.0‑liter supercharged V6 (common in the cabriolet and later coupes). Electrical demands and packaging differ slightly between them.

The following list highlights how configuration can affect the recommended or commonly fitted battery specification.

• S5 Coupe (4.2L V8) – Typically equipped with a robust AGM battery in the Group 48/H6 range, with around 70–80 Ah and roughly 730–800 CCA, sufficient for the high‑compression V8 and cold starts.
• S5 Coupe (3.0T V6, late markets) – Also commonly uses Group 48/H6 AGM, though some regions or cold‑climate packages may specify or accept Group 49/H8 for added reserve.
• S5 Cabriolet (3.0T V6) – Often specified with a higher‑capacity AGM unit, and in some markets may more frequently see Group 49/H8 due to additional electrical accessories (roof hydraulics/controls and comfort equipment).
• European vs. North American markets – Europe often references DIN or EN numbers and H6/H8 designations, while North America uses BCI Group 48/49. Functionally, they correspond closely in size and performance.

Although these differences exist, both coupe and cabriolet models generally remain within the same battery families, and physically compatible AGM units with proper specs are interchangeable if they meet Audi’s capacity and size guidelines.

Key Electrical Specs: Ah, CCA and Reserve Capacity

Beyond the physical size, what matters for the 2011 S5 is having enough amp‑hour capacity and cold cranking ability for reliable performance and to avoid stressing the vehicle’s charging system and control electronics.

What the Numbers Typically Look Like

The numbers can vary slightly by brand, but the commonly recommended range for the 2011 Audi S5 is relatively consistent among major battery manufacturers.

The list below summarizes the typical electrical specifications you will see on a suitable replacement battery for the 2011 S5.

• Voltage: 12 V (standard automotive).
• Amp‑hour (Ah) rating: Approximately 70–80 Ah for Group 48/H6; around 90–95 Ah for Group 49/H8.
• Cold Cranking Amps (CCA): Usually in the 650–850 CCA range; 730–800 CCA is typical for reputable AGM options.
• Reserve Capacity (RC): Often 120–160 minutes, depending on size and manufacturer; larger Group 49/H8 units usually offer the higher RC values.
• Chemistry: AGM (Absorbed Glass Mat) is strongly recommended and often required, especially if the car uses energy management systems tuned for AGM characteristics.

Staying within or above these ranges ensures that the S5’s power demands—particularly in cold climates or during extended accessory use—are met without compromising battery life or vehicle electronics.

Physical Fit and Installation Considerations

Even with the correct group number, it is important to confirm the battery will physically fit and integrate properly with the 2011 Audi S5’s mounting hardware and electrical system.

Dimensions, Terminals and Mounting

Group 48 and Group 49 batteries share the same general terminal orientation but differ in overall length and capacity. The S5’s battery compartment can typically accommodate either, but tolerances and hardware must be checked.

The list below explains the main fitment details owners and technicians should verify before purchase or installation.

• Tray size and hold‑down points: Ensure the chosen battery’s base and length match the tray and clamp positions; Group 49/H8 units are longer than Group 48/H6.
• Terminal type and placement: The S5 uses standard top‑post terminals with specific polarity orientation; replacing with a battery of reversed posts can cause cable‑reach issues or risk damage.
• Height clearance: Confirm the battery does not interfere with trim, covers, or wiring looms when the compartment is closed.
• AGM vs. flooded: While some flooded lead‑acid units may physically fit, Audi and most aftermarket catalogs recommend AGM due to heat, vibration, and charging characteristics.
• Ventilation: If the battery is installed in an enclosed or semi‑enclosed area (common on many Audis), the replacement must support proper venting as designed by the manufacturer.

Verifying these points in advance prevents fitment surprises and helps maintain factory‑level reliability and safety after the battery swap.

Battery Registration and Coding in the Audi S5

As with many modern German vehicles, the 2011 Audi S5 uses an energy management system that tracks battery condition and charging history. When the battery is replaced, it is best practice—and often necessary—to update the vehicle’s control module.

Why Coding or Registration Matters

The S5’s control electronics are calibrated for specific battery types and capacities. Installing a new battery without updating the system can lead to suboptimal charging or premature battery wear.

The following list outlines the key aspects of battery registration and coding relevant to a 2011 S5 owner or technician.

• Battery Energy Management (BEM): The car monitors battery state of charge and condition; a new battery should be “introduced” so the system resets its assumptions.
• Coding via diagnostic tools: Tools like VCDS (VAG‑COM), ODIS or other capable scanners can enter the new battery’s capacity, type (AGM), and manufacturer code into the relevant control module.
• Charging strategy adjustment: Proper registration ensures the alternator output and charge profile match the new battery’s chemistry and capacity, prolonging battery life.
• Error codes and warnings: Failing to code/register may not always throw an immediate error, but can contribute to intermittent electrical warnings or shortened battery service life.
• Professional installation: For many owners, having a qualified shop both install and code the battery is the most reliable approach, especially if they already work regularly on Audi models.

Correct coding and registration completes the battery replacement process, ensuring the new unit operates within the parameters Audi intended and supporting long‑term reliability.

How to Confirm the Exact Battery Size on Your Specific Car

Because production differences, prior replacements, and regional variations can all play a role, the best way to be absolutely sure about your 2011 S5’s battery size is to check the car itself and reference authoritative parts data.

Steps to Verify Before Purchasing

Even when Group 48/H6 or Group 49/H8 AGM batteries are generally correct, confirming specifics prevents ordering the wrong unit, especially when shopping online or comparing brands.

The list below gives practical steps owners can take to verify the exact specification needed.

• Inspect the existing battery label: Look for markings such as “H6,” “H8,” “48,” or “49,” along with Ah and CCA figures printed by the manufacturer.
• Check the owner’s manual: Many Audi manuals specify capacity and sometimes reference the recommended battery standard or type.
• Use your VIN with an Audi dealer: Providing the vehicle identification number allows a dealer parts department to pull the precise battery specification for your build.
• Consult reputable online catalogs: Major battery makers (e.g., Varta, Bosch, Exide, Interstate, etc.) maintain up‑to‑date fitment guides that list the correct group size and recommended product lines for the 2011 S5.
• Measure tray dimensions if in doubt: If previous owners have modified parts or installed non‑standard units, measuring the tray and hold‑down spacing can confirm whether Group 48, Group 49, or both will fit.

These checks provide clarity on the exact battery size and specification needed, ensuring that when you buy a replacement, it is fully compatible with your specific 2011 Audi S5.

Summary

The 2011 Audi S5 is typically equipped with a 12‑volt AGM battery in the Group 48 (H6) size, offering around 70–80 Ah and roughly 730–800 CCA, while some configurations and markets may use the larger Group 49 (H8) AGM with about 90–95 Ah and higher CCA. Both are designed to handle the S5’s substantial electrical demands. When replacing the battery, owners should confirm the existing size and specifications, choose an AGM unit with suitable capacity, ensure proper physical fit and venting, and have the new battery coded or registered to the vehicle’s energy management system for optimal performance and longevity.

What type of battery is in the Audi S5?

A 12V lead-acid battery is the most common type used in Audi S5 vehicles to start the engine and power electrical systems. It is reliable and cost-effective, making it ideal for petrol and diesel Audi S5 cars with standard power needs.

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. 
This video demonstrates how to find battery information on an Android phone: 58sWiz of AppsYouTube · Apr 3, 2024
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

What kind of battery does a 2011 Audi S5 take?

Duralast Gold Group Size 95R H9 Battery H9-DLG.

What battery does a 2011 Audi A5 take?

Duralast Group Size 49 H8 Battery H8-DL.