How many Ah does the Ruf Rt 12 Coupe 3.8 S battery need?

The exact Ah rating for the Ruf Rt 12 Coupe 3.8 S depends on the vehicle's original electrical consumers. Compatible batteries offer 70-77 Ah, 760-780 A (CCA), 12 V, case H6/L3, 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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RUF Rt 12 Coupe 3.8 S

Batteries for RUF Rt 12 Coupe 3.8 S 685 hp (petrol, 2009-2012)

RUF · Rt 12 Coupe

Which battery does a RUF Rt 12 Coupe 3.8 S need?

Specifications and battery: 3.8 S (685 hp)

Battery for RUF Rt 12 Coupe 3.8 S (685 hp, petrol, 2009-2012): a conventional 77 Ah, 780 A battery (278 × 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. (RUF504)

Recommended battery for this engine Car battery Varta E44 Dynamic SLI 12V 77Ah 780A €85.40 incl. VAT

View battery →

Brand: RUF
Model: Rt 12 Coupe
Built: 2009 - 2012
Power: 504 kW / 685 hp
Fuel: Petrol
Engine size: 3,746 cc (3.8 L)
Cylinders: 6
Body type: Coupe
Drive: Rear-Wheel Drive
Engine codes: RUF504
Start-Stop battery: Not required

Battery for this engine

Version	Technology	Capacity	Cold cranking (EN)	Size (L×W×H)	Polarity
Main	Conventional	77 Ah	780 A	278 × 175 × 190 mm	+ on the right

The same batteries also fit the 3.8 AWD (650 hp), 3.8 R AWD (750 hp) and 3.8 S AWD (685 hp) engines of this model.

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

EFB, AGM or conventional for this engine?

The RUF Rt 12 Coupe 3.8 S has no Start-Stop: a conventional lead-acid battery of around 77 Ah is enough and the cheapest option. An EFB or AGM also works (it lasts longer and copes better with short trips), but it is not essential.

🔧 Battery Expert Advisor

Battery analysis for your RUF Rt 12 Coupe 3.8 S

Quick answer You need an ordinary lead-acid battery of 77 Ah. Our recommendation: VARTA E44.

VARTAE44

ordinary lead-acid77 Ah780 A278×175×190

€85.40

Buy

Prices and availability updated on 08/11/2026

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

📋 What we found

For your RUF Rt 12 Coupe 3.8 S we found 7 compatible batteries. This list includes 5 Start-Stop batteries and 2 conventional batteries (non Start-Stop).

⚡ Battery type for your vehicle

✓ Your RUF Rt 12 Coupe 3.8 S 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)

Do you know whether your car's current battery is AGM or EFB?

Check your battery label: "AGM" or "VRLA" means AGM; "EFB" means EFB. If it says neither, it is probably conventional: on a Start-Stop car, ask us before buying. Never fit a conventional battery on a Start-Stop car, nor an EFB where an AGM was fitted.

Where do I check if my battery is AGM or EFB?

Can I fit an AGM if my car had EFB?

📊 View AGM vs EFB vs Conventional — full comparison

⭐ Our recommendation

Our recommendation

For your RUF Rt 12 Coupe 3.8 S we recommend the VARTA E44 (ordinary lead-acid, 77 Ah). It's the battery recommended by the vehicle manufacturer for your RUF Rt 12 Coupe 3.8 S — the OEM equivalent. It also delivers the most cranking power (CCA) on the list — a clear edge in cold starts. Varta is the world's leading manufacturer of starter batteries and supplies first-equipment (OEM) batteries to the major European car makers.

Rated 4.8/5 by 72 verified customers.
Get it on Tuesday before 5 PM — your product ships tomorrow.
37% cheaper than the most expensive option in the list.

See this battery →

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Verified selection

Class: Car Batteries
Brand: RUF
Model: Rt 12 Coupe
Engine: 3.8 S

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.

Conventional Battery

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

2 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 €81.90 View TUDOR TA770
EFB Up to 2× more cycles than a conventional battery. Good for short trips and city driving. from €84.60 +€2.70 View EXIDE EL700
AGM Up to 3× more cycles than a conventional battery. The highest performance, ideal with lots of electrical equipment. from €108.60 +€26.70 View TUDOR TK720

Why we recommend the VARTA E44

For €3.50 more you get +20 A cold cranking.

	RecommendedVARTA E44	CheapestTUDOR TA770
Cold cranking	780 A	760 A
Capacity	77 Ah	77 Ah
Technology	Conventional	Conventional
Why	OEM fitment	—
Price	€85.40	€81.90

View VARTA E44

Recommended conventional
Car battery Varta E44 Dynamic SLI 12V 77Ah 780A
- 12 V
- 77 Ah
- 780 A
Dimensions 278×175×190 mm
- ✓ OEM fitment
€85.40
Compare
Car battery Tudor TA770 High Tech 12V 77Ah 760A
- 12 V
- 77 Ah
- 760 A
Dimensions 278×175×190 mm

€81.90
Compare

Comparison table of available products
Category	Make	Reference	Capacity	Cold cranking	Dimensions	Technology	Price
Conventional Battery	VARTA	E44	77 Ah	780 A	278×175×190 mm	Conventional	€85.40	More info
Conventional Battery	TUDOR	TA770	77 Ah	760 A	278×175×190 mm	Conventional	€81.90	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.

5 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	€134.95	More info
Start-Stop & high energy demand batteries	EXIDE	EL700	70 Ah	760 A	278×175×190 mm	EFB	€84.60	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	TUDOR	TL700	70 Ah	760 A	278×175×190 mm	EFB	€95.40	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
€50.60

Frequently asked questions

: Battery for RUF Rt 12 Coupe 3.8 S (685 hp, petrol, 2009-2012): a conventional 77 Ah, 780 A battery (278 × 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. Compatible batteries offer 70-77 Ah, 760-780 A (CCA), 12 V, case H6/L3, conventional flooded technology. Browse the compatible battery list below.
: The exact Ah rating for the Ruf Rt 12 Coupe 3.8 S depends on the vehicle's original electrical consumers. Compatible batteries offer 70-77 Ah, 760-780 A (CCA), 12 V, case H6/L3, 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 RUF Rt 12 Coupe 3.8 S 685 hp (petrol, 2009-2012)

Which battery does a RUF Rt 12 Coupe 3.8 S need?