What Battery Does a 2011 Audi A5 Take?

A 2011 Audi A5 typically uses a Group H7 (also known as 94R) 12‑volt AGM battery with around 80–95 Ah capacity and 800+ cold cranking amps (CCA), though exact specs can vary slightly by engine, equipment, and market. Below is a detailed breakdown of the correct battery type, why it matters, and how to choose and replace it safely.

Understanding the 2011 Audi A5 Battery Specification

The 2011 Audi A5 is an electrically sophisticated car, and its battery must meet specific size, power, and technology requirements. Using the wrong type can cause electrical issues, shortened battery life, or charging problems, especially in models with advanced equipment like start/stop systems and high-demand infotainment.

Core Battery Type and Size

For most 2011 Audi A5 models, the standard fitment is a European H7/94R battery, with AGM technology in many cases, particularly for higher-spec trims or cars with greater electrical loads.

The following list outlines the common battery group and typical specs for a 2011 Audi A5.

• Battery group size: H7 (DIN/EN) / BCI Group 94R
• Technology: AGM (Absorbent Glass Mat) is recommended; some base models may use EFB or conventional flooded, but AGM is generally safest/most compatible
• Voltage: 12 V
• Capacity (Ah): typically 80–95 Ah (often around 80–85 Ah from factory)
• Cold Cranking Amps (CCA): roughly 770–850+ CCA, depending on brand
• Polarity / layout: Reversed (94R) – positive terminal usually on the right when posts face you
• Mounting location: In the trunk/boot under the floor, on the right side (varies slightly by body style/market)

These specifications ensure that the battery physically fits the mounting tray, connects correctly, and provides enough power for the Audi A5’s electrical system and cold starts.

Engine Variants and Trim-Level Differences

Although the battery group size is generally the same across the 2011 Audi A5 lineup, some small differences can appear depending on engine and equipment.

The list below highlights how engine and options may influence the exact battery spec.

• 2.0 TFSI (petrol/gasoline, quattro or FWD): Commonly H7 AGM ~80 Ah, high CCA for cold starts and turbo support.
• 3.2 FSI / 3.0 TFSI (V6 petrol): Often higher-capacity AGM in the same H7 size, to support more accessories and higher load.
• 2.0 TDI / 3.0 TDI (diesel): Typically require robust CCA due to higher compression; again, H7/94R AGM around 80–95 Ah is typical.
• Models with many electrical options: Bang & Olufsen audio, heated seats, navigation, and other options favor or require AGM for reliability and reserve capacity.
• Regions with cold climates: Dealers may fit batteries with higher CCA within the same size class.

While all of these engines generally share the H7/94R footprint, homeowners should match or slightly exceed the original Amp-hour and CCA ratings for best performance.

AGM vs. Conventional Batteries for the Audi A5

The 2011 Audi A5’s charging system is designed with modern, high-demand electronics in mind, which is why AGM batteries are common from the factory, especially in markets like Europe and North America.

Why AGM Is Typically Recommended

AGM batteries are more stable under heavy electrical loads and repeated deep cycling, making them well-suited to premium European cars.

The following list explains why AGM is usually the best choice for a 2011 Audi A5.

• Higher electrical resilience: Handles frequent short trips, idling with accessories on, and stop‑and‑go traffic better than conventional flooded batteries.
• Improved vibration resistance: Beneficial for suspension and chassis dynamics, especially on rougher roads.
• Better cold-weather performance: Delivers higher starting power in low temperatures, which is important for turbocharged and diesel engines.
• Longer service life (in many cases): More cycles before performance drops, particularly when not fully recharged between drives.
• Low maintenance and sealed design: Reduced risk of acid spills; safer in trunk-mounted applications.

Because of these advantages, most quality replacement guides and Audi specialists recommend sticking with an AGM battery when replacing the original unit.

Key Dimensions and Fitment Details

Beyond voltage and capacity, physical size and terminal orientation must be correct so the battery fits properly and connects safely in your Audi A5.

Physical Size (Group H7 / 94R)

Group H7/94R batteries follow fairly standardized dimensions, though slight variations exist between brands.

The list below shows the typical measurements you should check when buying a replacement.

• Length: Approximately 315–354 mm (about 12.4–13.9 inches)
• Width: Approximately 175–190 mm (about 6.9–7.5 inches)
• Height: Approximately 175–190 mm (about 6.9–7.5 inches)
• Terminal layout: “R” (reversed) layout for Group 94R – positive terminal on the right when facing the posts
• Bottom hold-down: Standard European lip-style hold-down compatible with Audi’s mounting bracket

As long as the battery matches the H7/94R group, it will generally sit correctly in the battery tray and secure under the existing clamp system.

Choosing a Replacement Brand and Rating

Many reputable manufacturers produce compatible batteries for the 2011 Audi A5. The main priority is to match the specifications and quality level, rather than a particular badge.

Common Compatible Battery Lines

Several major brands offer AGM batteries in the H7/94R size suitable for the Audi A5, though availability varies by region.

The following list provides examples of typical product lines that meet or exceed OEM requirements.

• Varta / Bosch: Varta Silver Dynamic AGM (H7) / Bosch S5 A08 (AGM 94R)
• Exide: Exide AGM EK800 or similar 80 Ah H7 AGM models
• Yuasa: Yuasa AGM HSB019 / equivalent H7-style AGM
• Interstate (North America): MTX‑94R/H7 AGM
• OEM / Genuine Audi (VW Group): Usually labeled Varta or another OE supplier with Audi branding, typically 80–95 Ah AGM

While exact model numbers evolve over time, any reputable H7/94R AGM with matching or slightly higher Ah and CCA ratings will generally serve as a suitable replacement.

Matching OEM Amp-Hours and CCA

The factory label on your existing battery is the best reference. Audi typically equips the A5 with an 80–85 Ah AGM unit, but it can vary.

The list below summarizes best practices when aligning replacement specs with the original unit.

• Match or exceed capacity (Ah): If your battery is 80 Ah, choosing 80–95 Ah is usually safe and beneficial.
• Match or exceed CCA: Do not go below the original CCA; more CCA is acceptable and often better in cold climates.
• Stay within physical limits: Increasing Ah is fine as long as the battery remains the correct group size and fits the tray.
• Use the same technology: Replace AGM with AGM to avoid charging-system mismatches and premature wear.

Following these guidelines ensures the car’s alternator and energy-management system can work efficiently with the new battery.

Battery Replacement and Coding in a 2011 Audi A5

Unlike older cars, the 2011 Audi A5 uses an intelligent battery management system (BMS) that monitors the state of charge and adjusts the charging behavior. Replacing the battery is not just mechanical; ideally, the new battery should be “registered” or coded to the vehicle.

Mechanical Replacement Basics

The battery is usually located in the trunk under the floor panel on the right side. Replacing it involves standard safety and disconnection steps, but care is needed due to tight clearances and electronics.

The following list covers the main mechanical steps, in general terms (not a step-by-step workshop manual).

1. Open the trunk and remove the floor panel and any covers to access the battery compartment.
2. Ensure the ignition is off, remove the key, and keep doors closed if possible to reduce power draw.
3. Disconnect the negative terminal first, then the positive, and remove any vent tubes if present.
4. Undo the battery hold-down clamp and carefully lift out the old battery (they are heavy).
5. Place the new H7/94R AGM battery into the tray, ensuring orientation matches the original.
6. Reconnect the hold-down clamp, reattach any vent tubes, and connect the positive terminal first, then negative.
7. Secure everything and reinstall covers and trunk floor.

If you are not comfortable working around high-current electrical systems or lifting heavy batteries in a confined space, having a professional handle the job is sensible.

Why Battery Coding Matters

Audi’s BMS uses stored data about the battery’s age and type to regulate charging. When a new battery is installed but not coded, the system may continue treating it as a worn battery, leading to suboptimal charging and shortened life.

The next list explains key points about coding a new battery in a 2011 Audi A5.

• Battery registration: Involves telling the control module that a new battery has been fitted so it can reset age and state-of-health parameters.
• Battery type and capacity: The scan tool can input battery technology (AGM) and Ah rating so charging profiles are correct.
• Tools needed: Typically requires a diagnostic tool such as VCDS (VAG‑COM), ODIS, or a capable aftermarket scanner.
• Consequences of skipping coding: The car will usually still start and run, but the battery may not charge optimally, potentially reducing its lifespan and increasing risk of warning lights.

Most Audi specialists and many independent garages can code a replacement battery; it is generally recommended when switching battery type or brand.

Signs It’s Time to Replace the Battery

Even if your 2011 Audi A5 still starts, subtle symptoms may indicate a battery nearing end of life, particularly after 4–6 years of service.

The list below summarizes common warning signs that suggest you should plan a replacement soon.

• Slow or labored cranking: Engine turns over more slowly, especially after the car has been sitting or in cold weather.
• Electrical glitches: Random warning lights, infotainment resets, ticking relays, or dimming lights at startup.
• Battery warning light or energy management messages: The car may disable some comfort features to preserve power.

• Age: An original or older battery (5+ years) is statistically much more likely to fail without much notice.
• Measured low voltage: Repeated resting voltages significantly below about 12.3 V can indicate a failing or deeply sulfated battery.

Testing the battery with a professional load tester or at a reputable shop helps confirm whether replacement is necessary before a no‑start situation occurs.

Practical Advice Before You Buy

Because catalog data and vehicle options can vary by country and production batch, verifying your specific car’s needs is important before purchasing a replacement battery.

The concluding list offers practical steps to ensure you get the correct battery for your 2011 Audi A5.

• Check your existing battery label: Note the Ah, CCA, technology (AGM), and part number printed on the top or side.
• Use your VIN at parts counters: Dealers and quality parts stores can look up the exact factory spec via your Vehicle Identification Number.
• Confirm group size (H7/94R): Make sure the replacement is specifically listed as H7 or 94R with reversed terminals.
• Prefer well-known brands: Established suppliers generally provide better reliability and warranty support.
• Plan for coding: Factor in the cost and availability of battery registration/coding if you want optimal long-term performance.

Taking these steps before purchase reduces the risk of fitment surprises and helps ensure the new battery performs well for years.

Summary

A 2011 Audi A5 typically uses a Group H7 (BCI 94R) 12‑volt AGM battery, usually around 80–95 Ah with 770–850+ CCA, mounted in the trunk and designed to work with Audi’s battery management system. While some details can vary by engine and equipment, sticking with an H7/94R AGM unit that matches or slightly exceeds the original capacity and CCA is the safest choice. For best results, have the new battery coded or registered to the car’s control module so the charging system recognizes its type and age, ensuring reliable starts and long service life.

What kind of battery does a 2011 Audi A5 take?

Duralast Group Size 49 H8 Battery H8-DL.

Where is the battery on a 2011 Audi A5?

And then take the toolbox off and then it’s in there all right so now I’m just doing the capacity. Test. Let me just select the amp. Hours. That’s running at 49%.

What size battery is in the 2011 Audi s5?

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

What type of battery does an Audi A5 use?

A 12V lead-acid battery is the most common type used in Audi A5 vehicles to start the engine and power electrical systems. It is reliable and cost-effective, making it ideal for petrol and diesel Audi A5 cars with standard power needs.