Choosing the right battery for the Audi A4 B9 (2015-2023) is crucial to ensure the proper functioning of the vehicle’s advanced systems, including the Start-Stop system. All versions of this model require AGM (Absorbent Glass Mat) batteries, which are designed for intensive use demanded by Start-Stop technology. For most gasoline and diesel versions, such as the 1.4 TFSI, 2.0 TFSI, or 30 TDI, the minimum capacity is 70 Ah, with a cold cranking amperage (CCA) starting at 720 A. Example compatible models include Bosch S5A 08, Exide EK700, and Varta E39.
More demanding versions, such as the 2.0 TFSI Ultra, S4 TDI Mild Hybrid, or Avant RS4 2.9 TFSI, require batteries with a higher capacity—ranging from 80 to 96 Ah—and a CCA of up to 850 A. Example compatible models for these versions include Bosch S5A 11, Exide EK800, Halfords AGM 115, and Varta F21.
Interestingly, AGM batteries are not only better suited for frequent starts but are also more resistant to shocks and vibrations, making them ideal for vehicles equipped with powerful engines and modern systems. It is also worth noting that regular diagnostics of the electrical system can prevent premature battery wear.
When purchasing, ensure the battery is properly formatted and ready to work with the Start-Stop system to avoid issues with the car’s electronics. Choosing a trusted manufacturer such as Bosch, Exide, or Varta guarantees quality and reliability in any situation.
Audi A4 in version B9 was produced in the years 2015 – 2023. The following table presents information about batteries that match each of the engines available on the market.
Basic parameters of batteries suitable for Audi A4 (2015-2023):
| Layout | Terminal types | Base hold-down |
|---|---|---|
| 0 – positive on the right side | 1 | B13 |
Audi A4 B9 – petrol engines:
- 1.4 TFSI (110 kW) – with Start-Stop
- 2.0 TFSI Mild Hybrid (185 kW) – with Start-Stop
- 35 TFSI Mild Hybrid (110 kW) – with Start-Stop
- 40 TFSI Mild Hybrid (140 kW) – with Start-Stop
- 45 TFSI Mild Hybrid (180 kW) – with Start-Stop
- Avant 2.0 TFSI g-tron (125 kW) – with Start-Stop
| Model | Capacity and CCA | Dimensions (LxWxH) | Price |
|---|---|---|---|
| Bosch S5 AGM S5A 08 | 70 Ah 760 A | 278x175x190 mm | More |
| Exide AGM EK700 | 70 Ah 760 A | 278x175x190 mm | More |
| Exide AGM EK720 | 72 Ah 760 A | 278x175x190 mm | More |
| Halfords Standard AGM 096 | 70 Ah 720 A | 278x175x190 mm | More |
| Halfords Advanced AGM 096 | 70 Ah 760 A | 278x175x190 mm | More |
| Lucas Fusion AGM LF096 | 70 Ah 760 A | 278x175x190 mm | More |
| Varta Silver Dynamic AGM E39 | 70 Ah 760 A | 278x175x190 mm | More |
Audi A4 B9 – petrol engines:
- 2.0 TFSI (185 kW) – with Start-Stop
- 2.0 TFSI Ultra (140 kW) – with Start-Stop
- Avant RS4 2.9 TFSI (331 kW) – with Start-Stop
| Model | Capacity and CCA | Dimensions (LxWxH) | Price |
|---|---|---|---|
| Bosch S5 AGM S5A 11 | 80 Ah 800 A | 315x175x190 mm | More |
| Exide AGM EK800 | 80 Ah 800 A | 315x175x190 mm | More |
| Exide AGM EK820 | 82 Ah 800 A | 315x175x190 mm | More |
| Halfords Advanced AGM 115 | 80 Ah 800 A | 317x175x190 mm | More |
| Lucas Fusion AGM LF115 | 80 Ah 800 A | 315x175x190 mm | More |
| Varta Silver Dynamic AGM F21 | 80 Ah 800 A | 315x175x190 mm | More |
Audi A4 B9 – petrol engines:
- S4 3.0 TFSI (260 kW) – with Start-Stop
| 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 |
Audi A4 B9 – diesel engines:
- 30 TDI Mild Hybrid (100 kW) – with Start-Stop
- 35 TDI Mild Hybrid (120 kW) – with Start-Stop
- S4 TDI Mild Hybrid (255 kW) – with Start-Stop
| Model | Capacity and CCA | Dimensions (LxWxH) | Price |
|---|---|---|---|
| Bosch S5 AGM S5A 08 | 70 Ah 760 A | 278x175x190 mm | More |
| Exide AGM EK700 | 70 Ah 760 A | 278x175x190 mm | More |
| Exide AGM EK720 | 72 Ah 760 A | 278x175x190 mm | More |
| Halfords Standard AGM 096 | 70 Ah 720 A | 278x175x190 mm | More |
| Halfords Advanced AGM 096 | 70 Ah 760 A | 278x175x190 mm | More |
| Lucas Fusion AGM LF096 | 70 Ah 760 A | 278x175x190 mm | More |
| Varta Silver Dynamic AGM E39 | 70 Ah 760 A | 278x175x190 mm | More |
Audi A4 B9 – diesel engines:
- 2.0 TDI (110 kW) – with Start-Stop
- 2.0 TDI (140 kW) – with Start-Stop
- 2.0 TDI (90 kW) – with Start-Stop
- 3.0 TDI (160 kW) – with Start-Stop
- 3.0 TDI (200 kW) – with Start-Stop
- 30 TDI (90 kW) – with Start-Stop
- 35 TDI (110 kW) – with Start-Stop
- 40 TDI (140 kW) – with Start-Stop
- 45 TDI (170 kW) – with Start-Stop
- 50 TDI (210 kW) – with Start-Stop
| Model | Capacity and CCA | Dimensions (LxWxH) | Price |
|---|---|---|---|
| Bosch S5 AGM S5A 11 | 80 Ah 800 A | 315x175x190 mm | More |
| Exide AGM EK800 | 80 Ah 800 A | 315x175x190 mm | More |
| Exide AGM EK820 | 82 Ah 800 A | 315x175x190 mm | More |
| Halfords Advanced AGM 115 | 80 Ah 800 A | 317x175x190 mm | More |
| Lucas Fusion AGM LF115 | 80 Ah 800 A | 315x175x190 mm | More |
| Varta Silver Dynamic AGM F21 | 80 Ah 800 A | 315x175x190 mm | More |
If you’re still unsure which battery fits your Audi A4 , 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!