Audi A6 in version C5 was produced in the years 1997 – 2005. We invite you to a list of batteries matching individual engine versions.
Basic parameters of batteries suitable for Audi A6 (1997-2005):
| Layout | Terminal types | Base hold-down |
|---|---|---|
| 0 – positive on the right side | 1 | B13 |
Audi A6 C5 – petrol engines:
- 1.8
- 1.8 T
- 1.8 T quattro
- 2.0
| Model | Capacity and CCA | Dimensions (LxWxH) | Price |
|---|---|---|---|
| Bosch S4 S40 05 | 60 Ah 540 A | 242x175x190 mm | More |
| Bosch S5 S50 05 | 63 Ah 610 A | 242x175x190 mm | More |
| Exide Excell EB620 | 62 Ah 540 A | 242x175x190 mm | More |
| Exide Premium EA640 | 64 Ah 640 A | 242x175x190 mm | More |
| Halfords Standard HCB 027 | 62 Ah 550 A | 242x175x190 mm | More |
| Lucas Premium LP027 | 60 Ah 540 A | 243x175x190 mm | More |
| Lucas Supreme LS027 | 65 Ah 640 A | 242x175x190 mm | More |
| Varta Blue Dynamic D24 | 60 Ah 540 A | 242x175x190 mm | More |
| Varta Silver Dynamic D15 | 63 Ah 610 A | 242x175x190 mm | More |
For the petrol engine variants of the Audi A6 C5 produced between 1997 and 2005, namely the 1.8 T without Start-Stop, 1.8 T quattro without Start-Stop, 2.0 without Start-Stop, and 1.8 without Start-Stop, the selection of compatible batteries is quite consistent and straightforward. These engines, being relatively similar in terms of electrical demands and engine bay layout, are best matched with batteries featuring a capacity in the 60–65 Ah range. The recommended cold cranking amps (CCA) typically range from 540 to 640 A, providing reliable starting power and stable performance under various conditions.
The physical dimensions for batteries suitable for these engines should be approximately 242–243 mm in length, 175 mm in width, and 190 mm in height. This ensures a proper fit within the vehicle’s battery compartment and compatibility with standard mounting systems, specifically the B13 type. The batteries must have the 0 terminal layout (positive terminal on the right when facing the terminals), and use the type 1 terminal posts, which are standard for European vehicles of this class and era.
A variety of reputable battery manufacturers offer suitable models for these Audi A6 C5 petrol engines, including Bosch, Varta, Exide, Halfords, and Lucas. For example, batteries like the Bosch S4 S40 05 (60Ah, 540A), Bosch S5 S50 05 (63Ah, 610A), Varta Blue Dynamic D24 (60Ah, 540A), and Exide Premium EA640 (64Ah, 640A) all conform to the required specifications. These batteries are of the standard lead-acid type, designed for conventional ignition systems without the need to support Start-Stop technology, making them ideal for the mentioned engine versions. The focus should always be on choosing a battery that meets or slightly exceeds the original equipment specifications to ensure both reliability and longevity in day-to-day use.
Audi A6 C5 – petrol engines:
- 2.4
- 2.4 quattro
- 2.7
- 2.7 quattro
| Model | Capacity and CCA | Dimensions (LxWxH) | Price |
|---|---|---|---|
| Bosch S4 S40 08 | 74 Ah 680 A | 278x175x190 mm | More |
| Bosch S5 S50 08 | 77 Ah 780 A | 278x175x190 mm | More |
| Exide Excell EB740 | 74 Ah 680 A | 278x175x190 mm | More |
| Exide Premium EA770 | 77 Ah 760 A | 278x175x190 mm | More |
| Halfords Standard HCB 096 | 76 Ah 680 A | 278x175x190 mm | More |
| Lucas Premium LP096 | 75 Ah 680 A | 278x175x190 mm | More |
| Lucas Supreme LS096 | 78 Ah 780 A | 278x175x190 mm | More |
| Varta Blue Dynamic E11 | 74 Ah 680 A | 278x175x190 mm | More |
| Varta Silver Dynamic E44 | 77 Ah 780 A | 278x175x190 mm | More |
For the larger petrol engines in the Audi A6 C5 range, specifically the 2.4 without Start-Stop, 2.4 quattro without Start-Stop, 2.7 without Start-Stop, and 2.7 quattro without Start-Stop produced from 1997 to 2005, a higher-capacity battery is recommended to meet the increased electrical demands of these powertrains. These V6 engines require batteries with a capacity in the 74–78 Ah range, which provides ample energy reserve for both starting and supporting various onboard systems, particularly in vehicles equipped with additional features and quattro all-wheel drive.
The suitable cold cranking amps (CCA) for these engine variants falls between 680 and 780 A. This ensures consistent and reliable engine startup, even in colder climates or after extended periods of inactivity. The physical dimensions of the compatible batteries remain standardized at approximately 278 mm in length, 175 mm in width, and 190 mm in height. This sizing guarantees a proper fit within the existing battery tray and secure mounting using the B13 system, which is standard for this generation of Audi A6.
All recommended batteries for these engines feature a 0 terminal layout (with the positive terminal on the right when facing the terminals) and type 1 battery posts, consistent with European automotive standards. Leading battery manufacturers such as Bosch, Varta, Exide, Halfords, and Lucas provide several suitable options, including the Bosch S4 S40 08 (74Ah, 680A), Bosch S5 S50 08 (77Ah, 780A), Varta Blue Dynamic E11 (74Ah, 680A), and Exide Premium EA770 (77Ah, 760A). These are all standard lead-acid batteries, specifically designed for vehicles without Start-Stop systems, ensuring compatibility and optimal performance for the specified engine variants. When selecting a battery, it is important to focus on models that match or slightly surpass the original manufacturer’s specifications to ensure long-term reliability and the best operational results.
Audi A6 C5 – petrol engines:
- 2.7 T
- 2.7 T quattro
- 2.8
- 2.8 quattro
- 3.0
- 3.0 quattro
- 3.7
- 3.7 quattro
| Model | Capacity and CCA | Dimensions (LxWxH) | Price |
|---|---|---|---|
| Bosch S4 S40 11 | 80 Ah 740 A | 315x175x190 mm | More |
| Bosch S5 S50 11 | 85 Ah 800 A | 315x175x190 mm | More |
| Exide Excell EB800 | 80 Ah 640 A | 315x175x190 mm | More |
| Exide Premium EA900 | 90 Ah 720 A | 315x175x190 mm | More |
| Lucas Premium LP115 | 80 Ah 670 A | 317x175x190 mm | More |
| Varta Blue Dynamic F16 | 80 Ah 740 A | 315x175x190 mm | More |
| Varta Silver Dynamic F19 | 85 Ah 800 A | 315x175x190 mm | More |
For the most powerful petrol engines in the Audi A6 C5 lineup produced from 1997 to 2005, including the 2.8 quattro, 3.7 quattro, 3.7, 3.0 quattro, 3.0, 2.8, 2.7 T quattro, and 2.7 T—all without Start-Stop technology—battery requirements increase to accommodate higher electrical consumption and the greater demands of larger displacement and forced induction engines. These engines benefit from batteries with capacities in the 80–90 Ah range, which deliver the substantial energy reserves needed for reliable ignition and stable operation of all onboard systems, particularly in quattro all-wheel drive models or those with additional luxury features.
The recommended cold cranking amps (CCA) for these engines are between 640 and 800 A, supporting dependable cold starts and consistent performance in all weather conditions. Physically, the ideal batteries for these variants measure approximately 315–317 mm in length, 175 mm in width, and 190 mm in height. This ensures a precise fit in the battery compartment and secure installation using the B13 mounting system, which is standard for the Audi A6 C5 series.
These batteries must be configured with a 0 terminal layout (positive terminal on the right when facing the battery terminals) and type 1 terminal posts, aligning with European specifications for this vehicle generation. Well-known manufacturers such as Bosch, Varta, Exide, and Lucas offer several suitable models, including the Bosch S5 S50 11 (85Ah, 800A), Bosch S4 S40 11 (80Ah, 740A), Varta Blue Dynamic F16 (80Ah, 740A), Varta Silver Dynamic F19 (85Ah, 800A), Exide Premium EA900 (90Ah, 720A), Exide Excell EB800 (80Ah, 640A), and Lucas Premium LP115 (80Ah, 670A). All of these are standard lead-acid batteries, engineered for vehicles without Start-Stop systems, and guarantee optimal performance and long-term durability for the powerful engines listed above. When replacing the battery, it is advisable to select a model that meets or slightly exceeds the original equipment specifications to maintain the reliability and efficiency expected from these top-tier Audi A6 C5 variants.
Audi A6 C5 – petrol engines:
- 4.2 quattro
- S6 quattro
| Model | Capacity and CCA | Dimensions (LxWxH) | Price |
|---|---|---|---|
| Bosch S4 S40 13 | 95 Ah 800 A | 353x175x190 mm | More |
| Bosch S5 S50 13 | 100 Ah 830 A | 353x175x190 mm | More |
| Exide Excell EB950 | 95 Ah 800 A | 353x175x190 mm | More |
| Exide Premium EA1000 | 100 Ah 900 A | 353x175x190 mm | More |
| Halfords Standard HCB 019 | 95 Ah 850 A | 353x175x190 mm | More |
| Lucas Premium LP019 | 95 Ah 800 A | 354x175x190 mm | More |
| Lucas Supreme LS019 | 100 Ah 850 A | 354x175x190 mm | More |
| Varta Blue Dynamic G3 | 95 Ah 800 A | 353x175x190 mm | More |
| Varta Silver Dynamic H3 | 100 Ah 830 A | 353x175x190 mm | More |
For the high-performance petrol engines of the Audi A6 C5, specifically the 4.2 quattro and the S6 quattro produced between 1997 and 2005 and not equipped with Start-Stop systems, the battery requirements are even more demanding due to the substantial power output and extensive electrical systems in these models. These V8 engines, at the top of the range, require batteries with a significantly higher capacity to ensure reliable starting, especially under challenging conditions, and to support all onboard electronics, including advanced comfort and safety features.
The optimal batteries for the 4.2 quattro and S6 quattro are those with a capacity of 95 to 100 Ah, and a cold cranking amperage (CCA) between 800 and 900 A. This combination provides the necessary energy reserve and starting power, guaranteeing dependable performance even in low temperatures or after periods of inactivity. The physical dimensions for suitable batteries are standardized at approximately 353–354 mm in length, 175 mm in width, and 190 mm in height, which fits precisely within the battery tray designed for these flagship models. The recommended batteries feature a 0 terminal layout (with the positive terminal on the right when facing the battery) and use type 1 terminal posts, corresponding to the B13 mounting system prevalent in this generation of Audi A6.
Leading battery brands such as Bosch, Varta, Exide, Halfords, and Lucas offer several compatible options for these powerful engines. Notable examples include the Bosch S4 S40 13 (95Ah, 800A), Bosch S5 S50 13 (100Ah, 830A), Varta Blue Dynamic G3 (95Ah, 800A), Varta Silver Dynamic H3 (100Ah, 830A), Exide Premium EA1000 (100Ah, 900A), and Lucas Supreme LS019 (100Ah, 850A). All these batteries are of the standard lead-acid type, optimized for conventional ignition systems and designed to deliver robust and consistent performance, ensuring both reliability and longevity for the demanding 4.2 quattro and S6 quattro engine variants.
Audi A6 C5 – petrol engines:
- RS6 quattro
| Model | Capacity and CCA | Dimensions (LxWxH) | Price |
|---|---|---|---|
| Bosch S5 AGM S5A 13 | 95 Ah 850 A | 353x175x190 mm | More |
| Exide AGM EK950 | 95 Ah 850 A | 353x175x190 mm | More |
| Exide AGM EK960 | 96 Ah 850 A | 353x175x190 mm | More |
| Halfords Advanced AGM 019 | 95 Ah 850 A | 353x175x190 mm | More |
| Lucas Fusion AGM LF017 | 95 Ah 850 A | 353x175x190 mm | More |
| Varta Silver Dynamic AGM G14 | 95 Ah 850 A | 353x175x190 mm | More |
For the exclusive RS6 quattro petrol engine variant of the Audi A6 C5, produced between 2002 and 2005 and not equipped with a Start-Stop system, the battery requirements are among the most demanding in the entire model range. This high-performance, twin-turbocharged V8 engine places substantial demands on the vehicle’s electrical system, not only for reliable cold starts but also to support an array of advanced onboard electronics, performance systems, and luxury features specific to the RS6.
The ideal battery for the RS6 quattro should be of the AGM (Absorbent Glass Mat) type, reflecting the increased need for both starting power and deep cycle capability. Recommended batteries have a capacity of 95 to 96 Ah and a high cold cranking amperage (CCA) of 850 A, ensuring dependable performance in all weather conditions and under the high electrical loads typical for this model. The physical dimensions are standardized at 353 mm in length, 175 mm in width, and 190 mm in height, which matches the battery tray designed for the RS6’s engine bay and ensures secure mounting with the B13 system.
The correct configuration for these batteries is the 0 terminal layout, meaning the positive terminal is located on the right when facing the battery terminals, and the use of type 1 terminal posts in line with European standards. Reputable manufacturers offering suitable AGM batteries for the RS6 quattro include Bosch (S5A 13), Varta (Silver Dynamic AGM G14), Exide (AGM EK950 and EK960), Halfords (Advanced AGM 019), and Lucas (Fusion AGM LF017). All these batteries provide the robust electrical performance and reliability required for the RS6 quattro, making them the optimal choice for this flagship, high-output engine variant within the Audi A6 C5 family.
Audi A6 C5 – diesel engines:
- 1.9 TDI
| Model | Capacity and CCA | Dimensions (LxWxH) | Price |
|---|---|---|---|
| Bosch S4 S40 08 | 74 Ah 680 A | 278x175x190 mm | More |
| Bosch S5 S50 08 | 77 Ah 780 A | 278x175x190 mm | More |
| Exide Excell EB740 | 74 Ah 680 A | 278x175x190 mm | More |
| Exide Premium EA770 | 77 Ah 760 A | 278x175x190 mm | More |
| Halfords Standard HCB 096 | 76 Ah 680 A | 278x175x190 mm | More |
| Lucas Premium LP096 | 75 Ah 680 A | 278x175x190 mm | More |
| Lucas Supreme LS096 | 78 Ah 780 A | 278x175x190 mm | More |
| Varta Blue Dynamic E11 | 74 Ah 680 A | 278x175x190 mm | More |
| Varta Silver Dynamic E44 | 77 Ah 780 A | 278x175x190 mm | More |
For the diesel engine versions of the Audi A6 C5 produced between 1997 and 2005, specifically the 1.9 TDI models without Start-Stop technology, battery selection reflects the unique electrical demands of these popular and efficient powertrains. The 1.9 TDI engine, known for its reliable performance and moderate electrical requirements, is best paired with batteries offering a capacity in the 74–78 Ah range. This capacity ensures sufficient energy reserves for consistent cold starts, even in lower temperatures, and reliable operation of auxiliary systems typical for diesel vehicles of this era.
The recommended cold cranking amperage (CCA) for these engines ranges from 680 to 780 A, providing ample starting power to cope with the higher compression ratios characteristic of diesel engines. The physical dimensions for suitable batteries remain standardized at 278 mm in length, 175 mm in width, and 190 mm in height, perfectly matching the battery compartment and securing the battery in place using the B13 mounting system. The batteries must feature a 0 terminal layout, with the positive terminal on the right when facing the battery posts, and use type 1 terminal posts—both of which are standard for European vehicles of this generation.
Several reputable manufacturers offer batteries that meet these specifications, ensuring optimal compatibility and performance for the 1.9 TDI. Suitable options include the Bosch S4 S40 08 (74Ah, 680A), Bosch S5 S50 08 (77Ah, 780A), Varta Blue Dynamic E11 (74Ah, 680A), Varta Silver Dynamic E44 (77Ah, 780A), Exide Premium EA770 (77Ah, 760A), Exide Excell EB740 (74Ah, 680A), Halfords Standard HCB 096 (76Ah, 680A), Lucas Supreme LS096 (78Ah, 780A), and Lucas Premium LP096 (75Ah, 680A). All these batteries are of the standard lead-acid type, designed for conventional diesel ignition systems without the need for Start-Stop support. Choosing any of these batteries ensures dependable starting, consistent power delivery, and long-term reliability for the 1.9 TDI engine variant in the Audi A6 C5.
Audi A6 C5 – diesel engines:
- 2.5 TDI
- 2.5 TDI quattro
| Model | Capacity and CCA | Dimensions (LxWxH) | Price |
|---|---|---|---|
| Bosch S4 S40 11 | 80 Ah 740 A | 315x175x190 mm | More |
| Bosch S5 S50 11 | 85 Ah 800 A | 315x175x190 mm | More |
| Exide Excell EB800 | 80 Ah 640 A | 315x175x190 mm | More |
| Exide Premium EA900 | 90 Ah 720 A | 315x175x190 mm | More |
| Lucas Premium LP115 | 80 Ah 670 A | 317x175x190 mm | More |
| Varta Blue Dynamic F16 | 80 Ah 740 A | 315x175x190 mm | More |
| Varta Silver Dynamic F19 | 85 Ah 800 A | 315x175x190 mm | More |
For the 2.5 TDI and 2.5 TDI quattro diesel engines in the Audi A6 C5, produced from 1997 to 2005 and not equipped with Start-Stop technology, the battery requirements are more demanding compared to the smaller 1.9 TDI variant. Both the standard and quattro versions of the 2.5 TDI engine feature higher compression and increased electrical needs, especially during cold starts and when powering various onboard systems typical for this class of vehicle. As a result, these engines are best paired with batteries offering a capacity in the 80 to 90 Ah range, ensuring sufficient energy reserves to guarantee reliable ignition even in challenging conditions.
The recommended cold cranking amperage (CCA) for the 2.5 TDI engines ranges from 640 to 800 A, with higher CCA values providing additional assurance for consistent starting performance, particularly in colder climates or after periods of inactivity. Physically, the most suitable batteries for these engines measure approximately 315 to 317 mm in length, 175 mm in width, and 190 mm in height. This sizing matches the battery tray and ensures secure installation using the B13 mounting system, which is standard across the Audi A6 C5 range. The correct configuration for these batteries is the 0 terminal layout, meaning the positive terminal is positioned on the right when facing the battery terminals, and they use type 1 terminal posts, in line with European standards of the era.
Leading manufacturers such as Bosch, Varta, Exide, and Lucas provide several compatible battery options for the 2.5 TDI engines, including models like the Bosch S5 S50 11 (85Ah, 800A), Bosch S4 S40 11 (80Ah, 740A), Varta Blue Dynamic F16 (80Ah, 740A), Varta Silver Dynamic F19 (85Ah, 800A), Exide Premium EA900 (90Ah, 720A), Exide Excell EB800 (80Ah, 640A), and Lucas Premium LP115 (80Ah, 670A). All of these are standard lead-acid batteries designed specifically for vehicles without Start-Stop systems, providing robust starting power and long-term durability. When selecting a replacement battery for a 2.5 TDI or 2.5 TDI quattro, it is essential to choose a model that meets or slightly exceeds the original equipment specifications to ensure optimal reliability and performance for these high-torque diesel engines.
If you’re still unsure which battery fits your Audi A6 , or if you want to help others in their selection, please send us a photo of your current battery in the comment section at the bottom of the page. You can also send the picture to contact@whatbattery.co.uk (we will place it in the comments to also help other users). Be sure to specify the car model, year, type, as well as the engine capacity and power. We’ll do our best to assist you!