What Kind of Battery a 2017 Audi A3 Takes

A 2017 Audi A3 typically uses a Group 48 (H6) AGM 12‑volt battery with around 70–80 Ah capacity and 680–800 CCA, but the exact specification depends on engine, equipment, and climate package, so owners should confirm via the existing battery label, vehicle owner’s manual, or a parts catalog by VIN.

Understanding the 2017 Audi A3 Battery Specification

The 2017 Audi A3, like most modern German compact luxury cars, relies on a tightly specified 12‑volt battery that supports extensive electronics, start‑stop functionality (on many trims), and comfort features. Choosing the correct replacement battery is important not only for reliable starting, but also for protecting sensitive control modules and ensuring the car’s energy management system functions correctly.

The Most Common Battery Type: Group 48 (H6) AGM

For most 2017 Audi A3 configurations sold in the U.S. and much of Europe, the “standard” battery fitment is a Group 48 (also known as H6) absorbed glass mat (AGM) 12‑volt battery. This is a mid‑size European‑style battery that balances cranking power with enough reserve capacity for modern electronics.

Typical Core Specifications

The key technical characteristics for a typical replacement battery for a 2017 Audi A3 can be summarized by a few main parameters that consumers are most likely to see on product labels and fitment guides.

• Battery group size: BCI Group 48 / DIN H6 (most common fitment)
• Chemistry: AGM (Absorbent Glass Mat) is recommended, especially for start‑stop or high‑load electrical systems
• Nominal voltage: 12 V
• Capacity (Ah): Typically around 70–80 Ah, depending on brand and exact model
• Cold Cranking Amps (CCA): Commonly in the range of about 680–800 CCA
• Reserve capacity: Usually in the 120–140 minute range (varies by manufacturer)
• Terminal layout: Standard European layout for Group 48/H6, with positive terminal typically on the right when terminals are closest to you
• Mounting: Designed to fit the factory tray and clamp without modification

These specifications ensure the battery can physically fit the A3’s battery compartment and provide enough power for cold starts and electrical loads, while matching the expectations of Audi’s charging and energy management systems.

Why AGM Is Recommended for the 2017 Audi A3

While some lower‑spec vehicles can run reliably on conventional flooded lead‑acid batteries, the 2017 Audi A3 is generally better served with an AGM battery, particularly in trims equipped with start‑stop technology and heavy electronic loads.

Advantages of AGM for Modern Audi Systems

AGM batteries are designed for repeated deep discharge and recharge cycles, high accessory loads, and smoother performance under demanding conditions, which matches the electrical profile of a modern compact luxury car like the A3.

• Supports start‑stop systems: AGM is better at handling frequent engine restarts at traffic lights without rapid degradation.
• Improved vibration resistance: The internal glass mat construction resists vibration, which can lengthen service life.
• Lower self‑discharge: AGM batteries typically hold a charge longer when the car isn’t driven frequently.
• Better performance in cold weather: Higher CCA ratings and more consistent voltage can help in winter conditions.
• Spill resistant: AGM is sealed and more tolerant of being mounted in enclosed spaces, important in many European vehicle layouts.

These factors make AGM a near‑universal recommendation from both Audi and most aftermarket suppliers for the 2017 A3, even in markets where cheaper flooded options exist.

Variations by Engine, Trim, and Market

Although Group 48/H6 AGM is the most common answer, there are variations depending on the exact configuration of your 2017 Audi A3, such as engine choice, presence of quattro all‑wheel drive, and regional specifications.

Gas, Diesel, and S3 Variants

Different powertrains can slightly alter the precise battery capacity or rating, even if the physical size remains the same.

• 2.0 TFSI gasoline (common in North America): Typically a Group 48/H6 AGM around 70–80 Ah and roughly 680–800 CCA.
• 1.4 TFSI / smaller gasoline engines (more common in Europe): Often still Group 48/H6 AGM, sometimes with marginally lower Ah and CCA, depending on market and options.
• TDI diesel models (where sold in 2017): Diesels may favor slightly higher CCA for cold cranking, but usually within the same physical Group 48 / H6 footprint.
• Audi S3 (performance variant of the A3 line): Commonly uses the same physical size AGM battery, but often at the higher end of the Ah and CCA range to support additional performance and electronics.

In practice, parts catalogs and dealer systems usually point to the same Group 48/H6 AGM for most 2017 A3 and S3 trims, but the exact capacity and CCA can vary slightly by OEM supplier and region.

Regional and Climate Package Differences

Factory‑fit batteries can differ by country and climate package, which can influence the original battery’s capacity and cold‑weather performance ratings.

• Cold‑climate packages: Cars delivered to very cold markets may be equipped from the factory with higher‑CCA versions of the same size battery.
• Hot‑climate markets: May prioritize durability under high heat; still usually Group 48/H6 AGM, but internal design can differ by supplier.
• OEM suppliers: Brands like Varta, Exide, Moll, or Banner are commonly used in Europe, while U.S. dealers may stock batteries rebranded under Audi/VW part numbers sourced from similar manufacturers.

As long as the replacement battery matches the physical group size and is an AGM with equal or greater Ah and CCA ratings than the factory unit, it is generally considered an appropriate fit.

How to Confirm the Correct Battery for Your Specific 2017 Audi A3

Because of these small variations, the most reliable way to identify the exact replacement battery specification for a 2017 Audi A3 is to cross‑check several sources, starting with what is already in the car and ending with official or reputable databases.

Steps to Identify the Right Battery

Drivers can combine visual inspection, documentation, and database lookups to confirm a correct battery match and avoid issues with fitment or vehicle electronics.

1. Inspect the existing battery: Open the hood, locate the battery, and read the label. Note the group size (often H6/48), Ah rating, CCA, and whether it’s labeled “AGM.”
2. Check the owner’s manual: The manual typically lists the appropriate battery class or at least gives guidance on type and minimum specifications.
3. Use VIN‑based lookup: Reputable parts retailers and Audi dealers can enter your VIN into their system to return the correct specification and part number.
4. Match or exceed specs: When selecting an aftermarket battery, choose one that matches the group size and equals or exceeds the original Ah and CCA ratings.
5. Confirm terminal orientation and hold‑down compatibility: Ensure the terminals and base match the A3’s tray and clamp system to avoid modification.

Following these steps reduces the risk of buying a battery that does not fit properly or lacks the performance needed for the A3’s electrical demands.

The Importance of Battery Coding and Registration

Beyond choosing the proper hardware, modern Audis—including the 2017 A3—often require that a new battery be “registered” or “coded” in the vehicle’s control systems so that the charging strategy matches the new unit’s characteristics.

Why Coding Matters

The A3’s energy management system monitors the battery’s state of health and adjusts charging strategy to extend life and maximize efficiency. Installing a new battery without updating the control module can lead to suboptimal charging or premature wear.

• Charging optimization: The system tailors charging voltage and current based on the battery’s age, type, and capacity.
• Error prevention: Incorrect or missing coding can occasionally trigger warning lights or energy management fault messages.
• Battery longevity: Proper registration helps the system avoid overcharging or undercharging the new battery.
• Professional tools often required: Many shops use VCDS, ODIS, or other diagnostic tools; some higher‑end aftermarket shops also offer this service.

While some owners replace the battery without coding and experience no immediate issues, the recommended approach—especially with AGM batteries in an A3 of this generation—is to have the battery properly registered in the car’s ECU.

Aftermarket Brands and OEM‑Equivalent Options

Numerous reputable manufacturers offer AGM Group 48/H6 batteries that are compatible with the 2017 Audi A3, giving owners a range of choices at different price points and warranty levels.

Common Replacement Brands

In both North American and European markets, certain brands are particularly prevalent as OEM suppliers or aftermarket equivalents, often sharing similar underlying technology under different labels.

• Varta / Johnson Controls derivatives: Frequently used as OEM in Europe and often rebranded by automakers.
• Exide: Another common European and global supplier with Audi‑compatible AGM lines.
• Bosch: Offers AGM units that meet or exceed Audi’s specifications in the Group 48/H6 size.
• Interstate / DieHard / OEM‑branded: In the U.S., many Group 48 AGM options are available under these and similar labels.
• Audi Genuine Parts battery: Sold at dealers, usually sourced from one of the major OEM manufacturers with an Audi label and part number.

Choosing a well‑known brand that explicitly lists the 2017 Audi A3 as a compatible vehicle provides an added layer of assurance that the battery’s performance profile and physical dimensions will be correct.

Summary

The 2017 Audi A3 is generally equipped with a Group 48 (H6) AGM 12‑volt battery, typically in the 70–80 Ah and roughly 680–800 CCA range, though exact specifications can vary by engine, trim, climate package, and market. AGM technology is strongly recommended, especially for models with start‑stop and heavy electronic loads. Owners should verify fitment by checking the existing battery’s label, consulting the owner’s manual, and using VIN‑based parts lookups, then select a quality AGM battery that matches the physical group size and meets or exceeds the original electrical ratings. For best results and battery longevity, the new battery should also be properly registered or coded in the vehicle’s control system after installation.

What battery do I need for my Audi?

Your owner’s manual should tell you what Audi battery you need – or you can check it instantly by using our battery search tool at the top of this page. Our battery test technicians can also advise you. Whatever the answer, we’re likely to have you covered.

Do Audis need a special battery?

Yes, many modern Audis need a special type of battery, typically an Absorbed Glass Mat (AGM) battery, which is more advanced than a traditional lead-acid battery. These cars also require the new battery to be electronically registered to the car’s computer, as the vehicle’s charging system needs to be informed about the new battery’s specifications to function correctly and prevent damage. 
This video explains the benefits of AGM batteries for Audi vehicles: 49sChampagne S3YouTube · Apr 11, 2024
Why a special battery and process are needed 
This video explains why you need to register the battery on new Audis: 57sYOUCANICYouTube · Feb 5, 2024

• Increased electrical demand: Many Audis have sophisticated electrical systems, including start-stop technology, that require a high-performance, durable battery like an AGM. 
• Performance and longevity: AGM batteries are sealed, maintenance-free, and provide better cold-weather starting, a lower discharge rate, and can handle deep cycle charging better than traditional batteries. 
• Computer integration: European cars, including Audis, use a system that requires the new battery to be “registered” or “coded” to the vehicle’s computer (ECU). 
• Preventing damage: Without proper registration, the car’s alternator won’t charge the new battery correctly. It might overcharge it, reducing the new battery’s life and potentially causing other electrical issues. 

What you need to know

• Identify the correct battery: It’s crucial to get the right physical size, capacity (Amp-hours), and Cold Cranking Amps (CCA) for your specific Audi model. Many parts websites will allow you to search by your vehicle’s make and model to ensure compatibility. 
• Ensure proper registration: The new battery must be registered using a diagnostic tool like an OBD11 or VCDS. This process involves inputting the new battery’s details (e.g., manufacturer, serial number, capacity) into the car’s computer. 
• Consider professional help: While DIY replacement is possible, professional installation can ensure the correct battery type is chosen and properly registered, which is often recommended by Audi dealerships and specialists. 

This video demonstrates how to replace and register an Audi battery: 51sHayden SchreierYouTube · Sep 5, 2025

What size battery is in the Audi A3 2017?

Duralast Platinum Group Size 47 H5 EFB Battery H5-EFB.

What type of battery does an Audi A3 use?

Most Audi A3 models use a H6 (Group Size 48) battery, often an Absorbed Glass Mat (AGM) type, but sizes can vary by model year and trim. Some models may require an Enhanced Flooded Battery (EFB) or a different group size like H5. It’s important to confirm the correct battery size and type with your vehicle’s specific information before purchasing and to have the battery registered with the car’s computer system after replacement. 
Common battery types for Audi A3

• AGM (Absorbed Glass Mat): Many A3 models, especially newer ones, use an AGM battery, which is a type of sealed maintenance-free battery. 
• EFB (Enhanced Flooded Battery): Some A3 models, particularly those with start-stop technology, came with an EFB battery. 
• Group Size: The most common group size is H6 (also known as Group 48), but some models may use H5 (Group 47). 

What to check before replacing

• Verify the correct size: Always use a vehicle fitment tool or check your owner’s manual to ensure you get the correct group size (H6, H5, etc.) and terminal configuration. 
• Confirm battery technology: Check if your original battery is an AGM or EFB type, as this is important for performance and compatibility. 
• Battery registration: After installing a new battery, the vehicle’s computer system will need to be reset or “registered” to properly manage the charging system. This can often be done by an independent mechanic or with the right equipment.