Does the Audi A6 C8 55 Tfsi E Quattro need an AGM or EFB battery?

If your Audi A6 C8 55 Tfsi E Quattro has start-stop, regenerative braking or many electrical accessories, you will need an AGM or EFB battery. Check your vehicle's technical specifications.

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.

12,317 customer reviewsThank you for trusting us!Thank you! Excellent 4.5 out of 5

Audi A6 C8 55 Tfsi e quattro

Batteries for Audi A6 C8 55 Tfsi e quattro 252 hp

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

Audi · A6 C8

Which battery does a Audi A6 C8 55 Tfsi e quattro need?

Specifications and battery: 55 Tfsi e quattro (252 hp)

Audi A6 C8 55 Tfsi e quattro (252 hp) takes a 105 Ah, 950 A AGM battery (394 × 175 × 190 mm), with the positive terminal on the right. It is a Start-Stop battery, so it should not be replaced with a conventional one.

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

View battery →

Start-Stop battery: Yes (AGM/EFB)

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

The same batteries also fit the 40 TDI Mild Hybrid (204 hp), 40 TDI Mild Hybrid quattro (204 hp), 45 TDI Mild Hybrid quattro (211 hp), 45 TDI Mild Hybrid quattro (231 hp) and 5 more engines of this model.

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

EFB, AGM or conventional for this engine?

The Audi A6 C8 55 Tfsi e quattro has Start-Stop, so it needs an AGM battery of around 105 Ah to cope with the hundreds of restarts a day. A conventional battery in its place lasts a few months and the control unit ends up disabling Start-Stop. If the original was EFB you can upgrade to AGM, never the other way round.

🔧 Battery Expert Advisor

Battery analysis for your Audi A6 C8 55 Tfsi e quattro

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 01/11/2026

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 55 Tfsi e quattro we found 3 compatible Start-Stop batteries.

⚡ Battery type for your vehicle

✓ Your Audi A6 C8 55 Tfsi e quattro uses the Start-Stop system. Every battery shown is compatible — no conventional options to confuse you.

🔋 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 55 Tfsi e quattro we recommend the VARTA A4 (AGM, 105 Ah). It's the battery recommended by the vehicle manufacturer for your Audi A6 C8 55 Tfsi e quattro — 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 8 verified customers.
Get it on Tuesday before 5 PM — your product ships tomorrow.

See this battery →

Was this advisor helpful?

Verified selection

Class: Car Batteries
Brand: Audi
Model: A6 C8
Engine: 55 Tfsi e quattro

Order now with express shipping: your product ships tomorrow and arrives on Tuesday before 5 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

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
€50.60

Frequently asked questions

: Audi A6 C8 55 Tfsi e quattro (252 hp) takes a 105 Ah, 950 A AGM battery (394 × 175 × 190 mm), with the positive terminal on the right. It is a Start-Stop battery, so it should not be replaced with a conventional one. Compatible batteries offer 105 Ah, 950 A (CCA), 12 V, case H9/L6, Start-Stop (EFB/AGM) technology. Browse the compatible battery list below.
: If your Audi A6 C8 55 Tfsi E Quattro has start-stop, regenerative braking or many electrical accessories, you will need an AGM or EFB battery. Check your vehicle's technical specifications.
: 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 uses a Start-Stop battery (AGM or EFB): do not replace it with a conventional one. The manufacturer requires the new battery to be registered via OBD with a diagnostic tool and, if you change technology (EFB → AGM), coded; without this step it lasts much less.

Batteries for Audi A6 C8 55 Tfsi e quattro 252 hp

Which battery does a Audi A6 C8 55 Tfsi e quattro need?