Can I install a higher capacity battery in my Audi A6 C5 3.7?

Yes, you can install a higher capacity (Ah) battery as long as the physical dimensions fit your Audi A6 C5 3.7 battery compartment and the positive terminal position matches.

What battery fits the Audi A6 C5 3.7?

The Audi A6 C5 3.7 requires a battery with the correct capacity (Ah) and Cold Cranking Amps (CCA) for this engine. Compatible batteries offer 70-100 Ah, 760-830 A (CCA), 12 V, case H8/L5, conventional flooded technology. Browse the compatible battery list below.

How many Ah does the Audi A6 C5 3.7 battery need?

The exact Ah rating for the Audi A6 C5 3.7 depends on the vehicle's original electrical consumers. Compatible batteries offer 70-100 Ah, 760-830 A (CCA), 12 V, case H8/L5, conventional flooded technology. Use our finder for a precise recommendation.

How long does a battery last in a Audi A6 C5 3.7?

With normal use, a battery for the Audi A6 C5 3.7 lasts 3–5 years. A healthy alternator and avoiding deep discharges significantly extend battery life.

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 C5 3.7

Batteries for Audi A6 C5 3.7 260 hp (petrol, 1999-2005)

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

Audi · A6 C5

Which battery does a Audi A6 C5 3.7 need?

Specifications and battery: 3.7 (260 hp)

Audi A6 C5 3.7 (260 hp, petrol, 1999-2005): depending on the equipment, it takes a conventional 95 Ah, 800 A battery (353 × 175 × 190 mm) or a 70 Ah, 760 A AGM battery (278 × 175 × 190 mm). Measure your current battery before choosing. In every case the positive terminal is on the right. (AQG)

Recommended battery for this engine Car battery Varta G3 Dynamic SLI 12V 95Ah 800A €95.20 incl. VAT

View battery →

Brand: Audi
Model: A6 C5 (4B2, 4B4)
Built: 03/1999 - 01/2005
Power: 191 kW / 260 hp
Fuel: Petrol
Engine size: 3,697 cc (3.7 L)
Cylinders: 8
Body type: Saloon
Drive: Front-Wheel Drive
Engine codes: AQG

Battery for this engine

Version	Technology	Capacity	Cold cranking (EN)	Size (L×W×H)	Polarity
Depending on equipment 1	Conventional	95 Ah	800 A	353 × 175 × 190 mm	+ on the right
Depending on equipment 2	AGM	70 Ah	760 A	278 × 175 × 190 mm	+ on the right

The same batteries also fit the 2.7 quattro (254 hp), 2.8 quattro (180 hp) and 3.7 quattro (260 hp) engines of this model.

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

EFB, AGM or conventional for this engine?

Rule of thumb for the Audi A6 C5 3.7: 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 95 Ah.

🔧 Battery Expert Advisor

Battery analysis for your Audi A6 C5 3.7

Quick answer Depending on the equipment, your car uses one of these two main batteries. The most common option is ordinary lead-acid 95 Ah (353×175×190 mm): we recommend VARTA G3. Other units use AGM 70 Ah (278×175×190 mm): VARTA A7. Before buying, check the Ah on your current battery's label or measure its length.

Batteries in your Audi A6 C5 3.7

MainDepends on equipmentSee all in the list →

Measure the length of yours: 353 or 278 mm

Recommended

VARTA G3

ordinary lead-acid95 Ah800 A

353 × 175 × 190 mm

€95.20Buy

Alternative

VARTA A7

AGM70 Ah760 A

278 × 175 × 190 mm

€122.95Buy

Prices and availability updated on 10/11/2026

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

📋 What we found

For your Audi A6 C5 3.7 we found 8 compatible batteries. This list includes 3 Start-Stop batteries and 5 conventional batteries (non Start-Stop).

📏 Battery size

The list contains batteries in different sizes or capacities (Ah). In many cases both variants fit, but it's worth checking your compartment dimensions and the Ah of your original battery before buying. Choose the one with the same dimensions as your current battery: a bigger one may not fit the compartment or the hold-down. If several match your size, the higher capacity gives more headroom for cold starts.

⚡ Battery type for your vehicle

✓ Your Audi A6 C5 3.7 does not need a Start-Stop battery. The conventional ones shown fit your vehicle and are the most affordable option. If you want a higher-quality, longer-lasting battery, you can also fit an EFB or AGM as an upgrade — they are fully compatible and last more years.

🔋 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 C5 3.7 we recommend the VARTA G3 (ordinary lead-acid, 95 Ah). It's the battery recommended by the vehicle manufacturer for your Audi A6 C5 3.7 — 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 5.0/5 by 8 verified customers.
Get it tomorrow if you order before 6 PM.
23% cheaper than the most expensive option in the list.

See this battery →

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Verified selection

Class: Car Batteries
Brand: Audi
Model: A6 C5
Engine: 3.7

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.

Conventional Battery

This is a standard or conventional battery for vehicles without a start-stop system

5 products

Compare the technologies available for your car

A higher technology withstands more charge and discharge cycles, according to manufacturers. If your car has Start-Stop, it needs EFB or AGM.

Conventional (lead-acid) For normal use in cars without Start-Stop. from €82.80 View EXIDE EB950
AGM Up to 3× more cycles than a conventional battery. The highest performance, ideal with lots of electrical equipment. from €108.60 +€25.80 View TUDOR TK720

Why we recommend the VARTA G3

For €12.40 more: OEM fitment.

	RecommendedVARTA G3	CheapestEXIDE EB950
Cold cranking	800 A	800 A
Capacity	95 Ah	95 Ah
Technology	Conventional	Conventional
Why	OEM fitment	—
Price	€95.20	€82.80

View VARTA G3

Recommended conventional
Car battery Varta G3 Dynamic SLI 12V 95Ah 800A
- 12 V
- 95 Ah
- 800 A
Dimensions 353×175×190 mm
- ✓ OEM fitment
€95.20
Compare
🔥 Most popular
Car battery Varta H3 Dynamic SLI 12V 100Ah 830A
- 12 V
- 100 Ah
- 830 A
Dimensions 353×175×190 mm

€109.90
Compare
Car battery Tudor TA1000 High Tech 12V 100Ah 900A
- 12 V
- 100 Ah
- 900 A
Dimensions 353×175×190 mm

€100.80
Compare
Car battery Tudor TB950 Technica 12V 95Ah 800A
- 12 V
- 95 Ah
- 800 A
Dimensions 353×175×190 mm

€86.90
Compare
Car battery Exide EB950 Excell 12V 95Ah 800A
- 12 V
- 95 Ah
- 800 A
Dimensions 353×175×190 mm

€82.80
Compare

Comparison table of available products
Category	Make	Reference	Capacity	Cold cranking	Dimensions	Technology	Price
Conventional Battery	VARTA	G3	95 Ah	800 A	353×175×190 mm	Conventional	€95.20	More info
Conventional Battery	VARTA	H3	100 Ah	830 A	353×175×190 mm	Conventional	€109.90	More info
Conventional Battery	TUDOR	TA1000	100 Ah	900 A	353×175×190 mm	Conventional	€100.80	More info
Conventional Battery	TUDOR	TB950	95 Ah	800 A	353×175×190 mm	Conventional	€86.90	More info
Conventional Battery	EXIDE	EB950	95 Ah	800 A	353×175×190 mm	Conventional	€82.80	More info

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

Comparison table of available products
Category	Make	Reference	Capacity	Cold cranking	Dimensions	Technology	Price
Start-Stop & high energy demand batteries	VARTA	A7	70 Ah	760 A	278×175×190 mm	AGM	€122.95	More info
Start-Stop & high energy demand batteries	TUDOR	TK720	72 Ah	760 A	278×175×190 mm	AGM	€108.60	More info
Start-Stop & high energy demand batteries	EXIDE	EK720	72 Ah	760 A	278×175×190 mm	AGM	€108.60	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 C5 3.7 battery compartment and the positive terminal position matches.
: The Audi A6 C5 3.7 requires a battery with the correct capacity (Ah) and Cold Cranking Amps (CCA) for this engine. Compatible batteries offer 70-100 Ah, 760-830 A (CCA), 12 V, case H8/L5, conventional flooded technology. Browse the compatible battery list below.
: The exact Ah rating for the Audi A6 C5 3.7 depends on the vehicle's original electrical consumers. Compatible batteries offer 70-100 Ah, 760-830 A (CCA), 12 V, case H8/L5, conventional flooded technology. Use our finder for a precise recommendation.
: With normal use, a battery for the Audi A6 C5 3.7 lasts 3–5 years. A healthy alternator and avoiding deep discharges significantly extend battery life.
: 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 C5 3.7 260 hp (petrol, 1999-2005)

Which battery does a Audi A6 C5 3.7 need?