What Kind of Battery Does a 2007 Audi A4 Take?
A 2007 Audi A4 typically uses a 12‑volt Group 48 (H6) or Group 94R (H7) AGM or flooded lead-acid battery, depending on engine and equipment, with common specifications around 70–80 Ah and 680–800 CCA. Choosing the right replacement means matching physical size, terminal layout, capacity, and cold-cranking performance to the original equipment or current needs.
Contents
Understanding the 2007 Audi A4 Battery Specification
The 2007 Audi A4 sits at a point in Audi’s lineup where battery requirements vary slightly by engine (2.0T, 3.2 V6, some diesels in other markets) and by electrical equipment. While modern Audis with start-stop systems demand very specific AGM batteries and coding, the 2007 A4’s requirements are somewhat more forgiving, but correct sizing and type still matter for reliability and electronics health.
Typical Battery Group Sizes for the 2007 Audi A4
Battery “group size” refers to standardized physical dimensions and terminal layout. For the 2007 Audi A4, most major fitment guides and parts catalogs list two main group sizes that are considered correct replacements.
- Group 48 (H6) – Common fit for many 2007 A4 models
- Group 94R (H7) – Also listed for some trims and markets; slightly larger capacity
- European codes – Sometimes labeled as L2/L3 or simply H6/H7 in European catalogs
- Top-post, reverse layout – Typically negative terminal on the left when posts face you (94R means “reversed” terminals)
In practice, most U.S.-market 2007 A4s will accept either Group 48/H6 or Group 94R/H7, but you should visually confirm what is currently installed and ensure the new unit physically fits the battery tray and hold-down points.
Recommended Battery Chemistry: AGM vs. Flooded Lead-Acid
While the 2007 Audi A4 did not universally ship with absorbent glass mat (AGM) batteries, many replacement guides now recommend AGM as an upgrade because of modern accessory loads and the car’s sensitivity to voltage fluctuations.
- AGM (Absorbent Glass Mat)
- Better resistance to deep discharge and repeated cycling
- Improved vibration resistance and spill-proof design
- More stable voltage delivery for sensitive electronics
- Often comes with longer warranty and higher price
- Flooded/Standard lead-acid
- Usually cheaper and widely available
- Acceptable if you drive regularly and the car is well-maintained
- More susceptible to sulfation if the car sits for long periods
For owners who use the A4 as a daily driver in mixed climates, AGM in Group 48/H6 or 94R/H7 is often considered the best balance of durability, performance, and long-term cost, even if the original battery was a standard flooded unit.
Core Specifications: CCA, Ah, and Reserve Capacity
A compatible physical size is only part of the equation. Performance ratings determine how well the battery will crank the engine in cold weather and how long it can support electrical loads with the engine off.
Cold Cranking Amps (CCA)
Cold Cranking Amps measure how much current the battery can deliver at 0°F (−18°C) for 30 seconds while maintaining a minimum voltage. For the 2007 Audi A4, typical CCA ranges fall into a fairly robust band.
- Typical CCA range: about 680–800 CCA for quality replacement batteries
- Gasoline engines (2.0T, 3.2): often specified in the mid–high 600s CCA from the factory
- Colder climates: stepping up to 750–800 CCA can improve cold starts
- Avoid under-specced batteries: CCA significantly below 600 is not recommended
While going slightly higher in CCA is generally fine, staying at or above the factory rating is important for reliable starting, particularly in winter or for engines that already have some age-related wear.
Capacity: Amp-Hours (Ah) and Reserve Capacity
Amp-hour (Ah) capacity and reserve capacity matter for a car like the Audi A4, which powers a fair number of control modules, comfort systems, and accessories even with the engine off.
- Common Ah ratings: roughly 70–80 Ah for Group 48/94R batteries suitable for the A4
- Reserve capacity (RC): typically in the range of 120–140 minutes for higher-quality models
- Heavier electrical use (heated seats, audio upgrades, accessories): benefits from higher Ah/RC ratings within the same group size
- Exact OEM label: originally printed on the factory battery’s top or side; helpful if still present
Matching or slightly exceeding the original battery’s Ah rating ensures that the A4’s electrical system has adequate buffer when the car is parked, especially if you frequently use accessories with the engine off.
How to Confirm the Correct Battery for Your Specific 2007 A4
Because the 2007 A4 was sold globally with different engines and option packages, the most reliable way to choose a replacement is to both consult fitment data and physically check your car.
Steps to Identify the Right Battery
Confirming compatibility is a straightforward process that blends documentation with on-the-car checks.
- Check the existing battery label
- Look for markings like “48/H6” or “94R/H7” on the top or side
- Note CCA, Ah, and any part number (e.g., VAG, Varta, Moll, Exide)
- Consult the owner’s manual
- Locate the specifications section; Audi often lists minimum capacity and type
- Check for any mention of AGM or coding requirements
- Use reputable parts catalogs
- Input year, make, model, and engine at major parts retailers’ sites
- Cross-check recommended group sizes and specifications
- Measure the battery tray
- Measure length, width, and height if there is any doubt
- Confirm that hold-downs and cables will reach the terminals correctly
- Verify terminal layout
- Ensure the new battery’s positive and negative posts match the existing orientation
- Look for “R” (reversed) where applicable, as with 94R
Taking these steps avoids common pitfalls such as buying a battery that physically fits but has incorrect terminals, or one that meets group size standards yet falls short on capacity for the car’s electrical load.
Installation and Electronic Considerations
Although the 2007 A4 is simpler than newer Audis in terms of battery integration, it still uses control modules that expect stable voltage and can flag low-voltage conditions. A careful installation helps maintain long-term reliability.
Battery Registration and Coding
Some later Audis require “battery coding” so the car’s energy management system recognizes the exact battery type and age. For a 2007 A4, this requirement is less rigid but still worth understanding.
- No mandatory coding on most 2007 A4s: Many mechanics replace the battery without any adaptation
- Energy management module: Still tracks voltage and may benefit from correct info if coding is available
- Scan tool use: Advanced shops may use VCDS/ODIS to clear low-voltage fault codes after replacement
- AGM retrofit: If switching from flooded to AGM, consult a specialist shop to confirm any recommended adaptations
Even if your particular A4 does not insist on battery coding, making sure connections are clean and voltage is stable—especially during and immediately after replacement—prevents nuisance electrical issues and fault codes.
Practical Tips for Replacement
Replacing a battery in a 2007 Audi A4 is within reach for a careful DIY owner, but the electrical complexity means a methodical approach pays off.
- Use memory-saver tools cautiously
- A 12V memory saver can preserve radio presets and module settings
- Improper use, however, can introduce voltage spikes; follow device instructions closely
- Inspect and clean terminals
- Check for corrosion, cracked clamps, or frayed cables
- Use a battery terminal brush and apply a thin layer of dielectric grease after cleaning
- Secure the battery firmly
- Ensure the hold-down bracket is properly tightened
- A loose battery can be damaged by vibration and affect safety in a crash
- Check system voltage after install
- With engine off: about 12.4–12.8 V for a healthy, fully charged battery
- With engine running: generally 13.7–14.7 V, confirming correct alternator output
Following these basic steps not only helps the new battery last longer but also protects the A4’s electrical system from low-voltage events and intermittent problems.
Brand Choices and Quality Considerations
The badge on the battery is less important than meeting the correct size and specification, but brand quality and warranty length can influence long-term ownership costs.
What to Look For in a Replacement Battery
Several criteria distinguish robust, reliable batteries from bare-minimum options that may struggle in demanding conditions.
- Meets or exceeds OEM specs
- Same or higher CCA than factory rating
- Similar or higher Ah/RC within the same group size
- Reputable manufacturer
- Well-known brands (e.g., Bosch, Varta, Exide, Johnson Controls–built labels, East Penn–built labels)
- Solid track record in European vehicles
- Warranty coverage
- Look for at least 3-year free replacement on AGM where available
- Check terms for pro-rated vs. full replacement periods
- Fresh manufacturing date
- Prefer batteries less than about 6 months old at purchase
- A fresher battery is less likely to have suffered storage-related sulfation
Balancing cost, capacity, and warranty with your climate and driving habits will lead to a battery that reliably supports the 2007 A4’s electrical demands for years rather than months.
Summary
The 2007 Audi A4 generally takes a 12‑volt Group 48 (H6) or Group 94R (H7) automotive battery, with typical specifications of roughly 70–80 Ah and 680–800 CCA. AGM batteries are widely recommended today for their durability and compatibility with the vehicle’s electronics, although a high-quality flooded lead-acid unit that meets OEM ratings can still be suitable.
Owners should confirm the exact group size and rating by inspecting the existing battery, consulting the owner’s manual, and cross-checking parts catalogs. Ensuring correct physical fit, terminal orientation, and performance specs—and installing the battery carefully—will help the 2007 Audi A4 start reliably and keep its electrical systems stable, whether in everyday commuting or more demanding conditions.
What size battery is in the 2007 Audi A4?
Duralast Group Size 94R H7 Battery H7-DL.
What size battery does the Audi A4 use?
Most Audi A4 models use an H6 (Group Size 48) or H7 (Group Size 94R) battery, depending on the year and trim.
Which battery is best for Audi?
Both Audi and Mercedes use AGM batteries in newer models, especially those with start-stop systems, advanced electronics, and luxury features (heated seats, infotainment systems, etc.).
Where is the battery in a 2007 Audi A4?
Do the Same on the positive. Take that off just slide that out of the way. There’s a vent tube right here you want to disconnect that just slide that out out of the way using a 6 mm hex socket.
