Can I install a higher capacity battery in my Audi A6 C8 40 TDI?

Yes, you can install a higher capacity (Ah) battery as long as the physical dimensions fit your Audi A6 C8 40 TDI battery compartment and the positive terminal position matches.

What battery fits the Audi A6 C8 40 TDI?

The Audi A6 C8 40 TDI requires a battery with the correct capacity (Ah) and Cold Cranking Amps (CCA) for this engine. Compatible batteries offer 105 Ah, 950 A (CCA), 12 V, case H9/L6, conventional flooded technology. Browse the compatible battery list below.

How many Ah does the Audi A6 C8 40 TDI battery need?

The exact Ah rating for the Audi A6 C8 40 TDI depends on the vehicle's original electrical consumers. Compatible batteries offer 105 Ah, 950 A (CCA), 12 V, case H9/L6, conventional flooded technology. Use our finder for a precise recommendation.

What type of battery does my car need?

You need the make, model and engine. If your car has Start-Stop (the engine switches off at traffic lights), it needs an EFB or an AGM battery, depending on what it came with: if it has an AGM, fit another AGM; if it has an EFB, another EFB or an AGM. On cars with battery management (BMW, Mercedes, VAG group…), moving from EFB to AGM requires coding the new battery. Without Start-Stop, a conventional battery is fine, or an EFB or AGM if you want a longer life.

What is the difference between AGM, EFB and standard batteries?

A conventional (lead-acid) battery is for cars without Start-Stop. An EFB is a reinforced conventional battery for basic Start-Stop. An AGM offers the highest performance and is fitted as standard on cars with advanced Start-Stop, regenerative braking or high electrical demand. Replacement rule: an AGM only with another AGM; an EFB with another EFB or an AGM; a conventional battery with any of the three. Never move down in technology.

How do I find the right battery for my vehicle?

Use the search tool by selecting your vehicle's make and model. Our system automatically filters compatible part numbers verified by our technicians. If you have any questions, contact us via WhatsApp.

What warranty do the batteries have?

All our batteries come with the legal guarantee provided by consumer law against manufacturing defects. If a battery has a manufacturing defect, it will be replaced at no cost to the user.

How long does it take for the battery to arrive?

Under normal circumstances, batteries usually arrive within 1 to 2 days of ordering. However, there are some cases where delivery may take a little longer: peak seasons (Black Friday, Christmas, etc.), palletized shipments, occasional stock shortages, etc.

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Audi A6 C8 40 TDI

Batteries for Audi A6 C8 40 TDI 190 hp (diesel, from 2019)

All engines and prices for this model: battery Audi A6 →

Audi · A6 C8

Which battery does a Audi A6 C8 40 TDI need?

Specifications and battery: 40 TDI (190 hp)

Battery for Audi A6 C8 40 TDI (190 hp, diesel, from 2019): a 105 Ah, 950 A AGM battery (394 × 175 × 190 mm), with the positive terminal on the right. Without Start-Stop a conventional battery is enough; an EFB or AGM of the same size is an optional upgrade. (DESA)

Recommended battery for this engine Start-Stop battery Varta A4 Dynamic AGM 12V 105Ah 950A AGM €189.30 incl. VAT

View battery →

Brand: Audi
Model: A6 C8 (4A2)
Built: 02/2019 - 2026
Power: 140 kW / 190 hp
Fuel: Diesel
Engine size: 1,968 cc (2 L)
Cylinders: 4
Body type: Saloon
Drive: Front-Wheel Drive
Engine codes: DESA
Start-Stop battery: Not required

Battery for this engine

Version	Technology	Capacity	Cold cranking (EN)	Size (L×W×H)	Polarity
Main	AGM	105 Ah	950 A	394 × 175 × 190 mm	+ on the right

Data: vehicle specifications and the battery manufacturer's application catalogue.

EFB, AGM or conventional for this engine?

Rule of thumb for the Audi A6 C8 40 TDI: fit the same technology as the original or better (conventional → EFB → AGM), with equal or higher capacity and cold cranking amps, and respect the size and terminal position of around 105 Ah.

🔧 Battery Expert Advisor

Battery analysis for your Audi A6 C8 40 TDI

Quick answer You need an AGM battery of 105 Ah. Our recommendation: VARTA A4.

VARTAA4

AGM105 Ah950 A394×175×190

€189.30

Buy

Prices and availability updated on 09/11/2026

Based on the batteries we found for your vehicle, our experts help you pick the right one.

📋 What we found

For your Audi A6 C8 40 TDI we found 3 compatible Start-Stop batteries.

⚡ Battery type for your vehicle

Your Audi A6 C8 40 TDI has no Start-Stop, but the manufacturer fits an AGM or EFB battery as standard because the charging system requires it. Choose one with the same technology.

🔋 Technology (AGM / EFB)

✓ All Start-Stop batteries in the list are AGM. If your current battery is AGM, this is the right replacement. If it is EFB, an AGM is also a valid upgrade, but on cars with battery management (BMW, Mercedes, VAG group…) it must be registered and coded for the new technology with a diagnostic tool; otherwise the car keeps charging it as an EFB.

📊 View AGM vs EFB vs Conventional — full comparison

⭐ Our recommendation

Our recommendation

For your Audi A6 C8 40 TDI we recommend the VARTA A4 (AGM, 105 Ah). It's the battery recommended by the vehicle manufacturer for your Audi A6 C8 40 TDI — the OEM equivalent. Varta is the world's leading manufacturer of starter batteries and supplies first-equipment (OEM) batteries to the major European car makers.

Rated 4.9/5 by 9 verified customers.
Get it tomorrow if you order before 6 PM.

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Verified selection

Class: Car Batteries
Brand: Audi
Model: A6 C8
Engine: 40 TDI

Receive them tomorrow before 5 PM if you order before 6 PM (Spain mainland and Portugal only).

Before you buy: check 3 key points

Although the batteries shown are sourced from information provided by manufacturers, we recommend checking on your current battery:

Dimensions (length × width × height, including terminals and protrusions)
The dimensions shown are the maximum of the battery and include the height of the terminals, small ridges at the base and any lateral protrusions. Measure your current battery completely, from edge to edge. The new one must be the same size or slightly smaller — never larger, it would not fit in the housing.
Positive terminal (left or right viewed from the front — check the battery photo carefully)
Stand facing the battery, with the manufacturer's label facing you and the terminals on top. Locate the terminal marked with +: if it is on your right, it is "positive right"; if it is on your left, it is "positive left". Do not rely on how the battery is mounted in the car — the position is always measured looking only at the battery itself.
Technology (AGM, EFB or conventional — the same as your current battery or higher)
Depending on the manufacturer, the same technology may be labelled differently: AGM may also appear as VRLA, AGM Start-Stop or AGM Deep Cycle. EFB may appear as EF, EFB+ or Enhanced Flooded Battery. Conventional may appear as SLI, Lead-Acid, Wet or Standard. If your vehicle has Start-Stop, the battery must be AGM or EFB — never conventional.

If you have any questions, just ask us and we'll be glad to advise you with no obligation.

Start-Stop & high energy demand batteries

AGM or EFB battery for start-stop vehicles and for cars with high energy demand (many electrical consumers, frequent starts). More charge cycles, better charge recovery and longer service life.

3 products

This engine comes with an AGM/EFB battery as standard: the car's charging system requires it even without Start-Stop. If in doubt, message us and we will confirm.

Comparison table of available products
Category	Make	Reference	Capacity	Cold cranking	Dimensions	Technology	Price
Start-Stop & high energy demand batteries	VARTA	A4	105 Ah	950 A	394×175×190 mm	AGM	€189.30	More info
Start-Stop & high energy demand batteries	EXIDE	EK1060	106 Ah	950 A	392×175×190 mm	AGM	€165.70	More info
Start-Stop & high energy demand batteries	TUDOR	TK1060	106 Ah	950 A	392×175×190 mm	AGM	€175.70	More info

Complete your purchase

Chargers

Chargers for your battery

1 product

Battery charger ABSAAR Pro4.0 6/12V 4A Smart Charger
- 6 V
€56.95

Frequently asked questions

: Yes, you can install a higher capacity (Ah) battery as long as the physical dimensions fit your Audi A6 C8 40 TDI battery compartment and the positive terminal position matches.
: The Audi A6 C8 40 TDI requires a battery with the correct capacity (Ah) and Cold Cranking Amps (CCA) for this engine. Compatible batteries offer 105 Ah, 950 A (CCA), 12 V, case H9/L6, conventional flooded technology. Browse the compatible battery list below.
: The exact Ah rating for the Audi A6 C8 40 TDI depends on the vehicle's original electrical consumers. Compatible batteries offer 105 Ah, 950 A (CCA), 12 V, case H9/L6, conventional flooded technology. Use our finder for a precise recommendation.
: You need the make, model and engine. If your car has Start-Stop (the engine switches off at traffic lights), it needs an EFB or an AGM battery, depending on what it came with: if it has an AGM, fit another AGM; if it has an EFB, another EFB or an AGM. On cars with battery management (BMW, Mercedes, VAG group…), moving from EFB to AGM requires coding the new battery. Without Start-Stop, a conventional battery is fine, or an EFB or AGM if you want a longer life.
: A conventional (lead-acid) battery is for cars without Start-Stop. An EFB is a reinforced conventional battery for basic Start-Stop. An AGM offers the highest performance and is fitted as standard on cars with advanced Start-Stop, regenerative braking or high electrical demand. Replacement rule: an AGM only with another AGM; an EFB with another EFB or an AGM; a conventional battery with any of the three. Never move down in technology.
: Use the search tool by selecting your vehicle's make and model. Our system automatically filters compatible part numbers verified by our technicians. If you have any questions, contact us via WhatsApp.
: All our batteries come with the legal guarantee provided by consumer law against manufacturing defects. If a battery has a manufacturing defect, it will be replaced at no cost to the user.
: Under normal circumstances, batteries usually arrive within 1 to 2 days of ordering. However, there are some cases where delivery may take a little longer: peak seasons (Black Friday, Christmas, etc.), palletized shipments, occasional stock shortages, etc.
: In mainland Spain delivery takes 24-48 working hours if you order before 6:00 pm (Monday to Friday) and the battery is in stock; mainland Portugal takes 1 to 4 working days, the Balearic Islands 2 to 5 working days and other EU destinations 4 to 7 working days. Batteries are shipped fully charged and ready to install.

Guides

: This vehicle has no Start-Stop. According to the manufacturer, it does not need to be registered after the change.

Batteries for Audi A6 C8 40 TDI 190 hp (diesel, from 2019)

Which battery does a Audi A6 C8 40 TDI need?