This will start them all

From modern flooded batteries for passenger cars, further developments such as EFB as well as AGM batteries for start-stop vehicles and vehicles with many consumers to SHD versions for trucks and special formats for classic cars or US vehicles - starter batteries are primarily there to operate the starter. In operation, however, they also cover consumption peaks that are not supplied directly by the alternator if no separate back-up battery is provided in the car to support the starter battery.

Buying advice for your starter battery!

intAct Battery-Power

Always start properly
intAct Start-Power NG

Always start properly

for passenger cars (also Asia models) to super-shakeproof for trucks.

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Top performance at a great price
intAct Start-Power

Top performance at a great price

for almost all passenger cars, coaches, trucks and agricultural machinery.

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The powerful all-rounder
intAct Race-Power

The powerful all-rounder

with good durability and excellent value for money.

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30% extra starting power
intAct Premium-Power

30% extra starting power

and fast loading for many consumers and short distance use.

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Start. Stop. Keep charging.
intAct Start-Stop-Power AGM

Start. Stop. Keep charging.

For taxis, medium and luxury class cars, SUVs and trucks with start-stop systems and micro-hybrids.

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Sart. Stop. Keep charging.
intAct Start-Stop-Power EFB

Sart. Stop. Keep charging.

For small and medium-sized cars with start-stop systems and micro-hybrids.

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Support for the starter battery
intAct BackUp-Power

Support for the starter battery

as an additional power supply for consumers, also during start-up.

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Starting power in retro look
intAct Oldtimer-Power

Starting power in retro look

with the latest battery technology and 80% hand-crafted.

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For American vehicles
intAct US-Power

For American vehicles

High performance battery matched to U.S. dimensions and end-pole types.

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Other brands

Optima Redtop
Highest starting performance
Optima Redtop

Highest starting performance

even with long downtimes. Perfect for emergency vehicles or generators.

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Odyssey Starter
Extreme starting power at any time
Odyssey Starter

Extreme starting power at any time

even in winter. Tolerates long-term discharge to deep discharge.

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Forster Batteries

Forster Premium Starter
Permanent top starting performance
Forster Premium Starter

Permanent top starting performance
combined with enormous weight savings and full installation flexibility for up to 100,000 starts.

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During the starting process, a lot of energy must be delivered quickly. Closed, maintenance-free calcium batteries are designed to do just that. They prepare the starting process of the engine and supply the starter with energy. We stock standard starter batteries for vehicles from older models to newer models (with charging voltage up to 14.8 volts), for heavy commercial vehicles, trucks, buses, agricultural and construction machinery.


Even though the job of starter batteries is always the same, some areas of application are special and require batteries that are designed to ensure reliability and a long service life in those conditions. Dual-purpose batteries are the adequate choice for vehicles with extreme start power requirements on one hand and demanding loads like professional hi-fi equipment or cable winches on the other hand. Some highly equipped vehicles even require a second battery providing backup for the starter battery. Classic and vintage car owners are excited about the retro-style of the nonetheless powerful starter batteries designed especially for these vehicles. And the batteries for US cars are equipped with sideways pole connectors.


The start-stop functionality makes specific demands on the starter battery. It has to manage an extremely high number of engine starts and supply enough power during motor stops for the attached loads. Start-stop batteries are specifically designed for this purpose - the AGM batteries (Absorbent Glass Mat) as well as the EFBs (Enhanced Flooded Batteries). They have extremely good recharging behaviour in the partial charge range as well as a significantly higher cycle stability compared to standard calcium batteries and are also suitable for micro hybrids with kinetic energy recovery systems and taxis.

What is a starter battery?

A battery that is charged by the alternator and starts the vehicle. For this purpose, the starter motor requires a lot of current for a short time. In addition to the cold start capacity (CCA), which indicates how much current the battery can ideally supply, the properties of a battery influence how reliably it can provide this starting power. A battery with very good charging properties recharges more quickly, for example, which benefits vehicles in city traffic in particular. It also supplies the consumers in vehicles without an additional back-up battery or supply battery. The more electrical consumers are installed at the factory or retrofitted, the more capacity is required to supply them when the vehicle is idling or at an engine stop and still reliably restart the vehicle.


You don't have to stick with the original technology.

An upgrade is always possible!

What types of starter batteries are there and for which vehicles are they suitable?

Car batteries

For normal passenger cars, also US vehicles, Asian models and classic cars, mostly modern, maintenance-free flooded batteries are used, such as the intAct Start-Power NG, the intAct Race-Power or the intAct Premium-Power.
These batteries are suitable for small cars, SUVs, jeeps, all-wheel drive vehicles, minivans, vans and many more.

If a back-up battery is provided in the car, AGM batteries such as our intAct Back-Up-Power are used for this purpose.

In vehicles with a lot of consumers, dual-purpose batteries like the Optima Redtop or the Odyssey starter batteries can be a good solution. Thanks to AGM technology with pure lead grids, they reliably supply power-hungry consumers and still start with high performance. This also makes them well suited for use in buses, motorhomes or boats in which no additional supply battery is installed.

Start-Stop batteries

The EFB (Enhanced Flooded Battery) was developed for start-stop vehicles. This further development of the wet battery is significantly more cycle resistant, like the intAct Start-Stop-Power EFB. Because of the good current reserve, AGM batteries are also used here, like the intAct Start-Stop-Power AGM.
Start-stop batteries are suitable for micro-hybrids with brake energy recovery/recuperation, taxis, boats and many more.

Truck batteries

Batteries in trucks, commercial vehicles, agricultural machines and buses have to be vibration resistant due to engine vibrations. Our truck batteries in SHD versions are vibration resistant according to V3, like intAct Start-Power NG Truck, or V4, like intAct Premium-Power Truck. For trucks with start-stop function EFB batteries are suitable, like the intAct Start-Stop-Power EFB Truck. They also cope well with the increased power consumption due to living in the driver's cab.
Truck batteries are suitable for agricultural machinery, construction vehicles, trucks, tractors, buses, coaches, emergency vehicles and much more.

Tips for buying a starter battery

1. The technical data

Do you need a regular starter battery or a start-stop battery?

In start-stop vehicles, the engine stops every time the vehicle is in neutral. This saves petrol and reduces air pollution. However, this means an extremely high load for the battery.

It has to start much more often, i.e. deliver high currents, than a normal starter battery. At the same time, it has to supply the consumers while the engine stops. Between stops, it only has a short time to recover the necessary current.

Therefore, only start-stop batteries designed for this load may be used in vehicles with start-stop systems. Normal starter batteries would age extremely quickly.

Then the only question left is: Do you need an EFB or AGM start-stop battery?

Do you need an AGM or EFB start-stop battery?

If an EFB start-stop battery is installed at the factory, it can be replaced again with an EFB start-stop battery. An upgrade to AGM is always possible.

If an AGM start-stop battery is installed at the factory, it may only be replaced with an AGM start-stop battery.

AGM batteries, with their high cold-start performance and good current consumption, are a good basis for start-stop batteries. EFB (Enhanced Flooded Battery) have similar strengths. They have evolved from the conventional flooded battery. A calcium grid alloy ensures better current transport in the cell and a higher cycle stability than in the classic wet battery. More information about the characteristics of the two start-stop types under intAct Start-Stop-Power AGM or intAct Start-Stop-Power EFB.

To register the start-stop battery in the vehicle management system, we recommend the BRT-12 battery replacement device.

Installation dimensions and terminals

First of all, a battery must fit in your vehicle or machine. Check the dimensions of your old battery or the available space in the battery compartment of your vehicle.

The placement of the terminals, i.e. where exactly the positive and negative terminals are located on the battery, and where the venting takes place, also play a role. If the poles are positioned differently than intended for your vehicle or machine, the lengths of the connecting cables may not be long enough, the poles may not be accessible or the battery may not fit in the intended place.

Equally important is the shape of the connection or end terminals, so that the screws or clamps present on your cables can be attached to the battery.

To ensure that your new battery fits your vehicle, the easiest way is to use our battery finder. All batteries that are suggested to you here for your vehicle are selected by us so that dimensions and specifications fit.

If you can't find your vehicle in the battery finder, the only thing that will help is to measure the old battery or the available space, cable lengths and connections.

On US vehicles, the connections are sometimes mounted differently (US front pole) and have different shapes than European or Asian vehicle models. Especially for these vehicles there is the intAct US-Power.

Voltage fits

In order not to damage either the connected loads or the battery, the voltage of the battery must fit.

Batteries are available with 6 or 12 volts. They consist of 3 or 6 cells of 2.12 volts each.

For applications that require more voltage, such as the on-board network of a truck, several 12-volt batteries are connected in series.

Always select battery suitable for load (CCA and Ah)

Ideally, current drain and current output should be in balance. This prevents the battery from ageing prematurely.

In the case of starter batteries, this means above all that the battery does not go into deep discharge when starting.

The cold start performance and the capacity play a role:

Cold start performance (CCA)

Starter batteries primarily have to start the vehicle. To do this, they must deliver as much current as possible during the starting process, so the battery's high-current characteristics are important. The cold cranking amps (CCA) value provides information about the starting performance. It indicates the maximum current that the battery can provide for 30 seconds under optimum conditions. Depending on what kind of vehicle you want to start, more or less starting power is needed. A large capacity construction vehicle needs more power than a modern scooter.

Our battery finder suggests the batteries that match the starting power of your vehicle.

Relevant to capacity: The electrical consumers

Even before the engine is started, the starter battery has to do a lot and supply standard equipment such as the lighting system. This draws current from the battery, which is no longer available for starting.

Nowadays, there are also a number of consumers that draw current before starting or while driving: Every electrical control element, every sensor and many measuring instruments need electricity to do their work. Also heaters and every mobile device that is permanently or temporarily connected to the vehicle.
Add up all these consumers and the question arises:

  • Is the current supplied by the alternator while driving enough to power all these consumers and charge the battery?

In order to check this, it is best to meticulously list all the consumers that are installed, especially all those that you have additionally installed, integrated or connected.
And find out how much current they require in amperes (A).
Batteries often have an Ah-value, which tells you how much current in amperes (A) the battery can supply for a certain duration in hours (h). Of course under optimal conditions.

Special case: cars with back-up battery

In some cars, so many consumers are installed from the outset that it would overload the starter battery to supply them. This is where so-called back-up batteries are used.

If your car is equipped with a back-up battery, you should replace it again with a battery for this purpose, like our intAct Back-Up-Power.

2. Your individual requirements

Each battery technology has particular strengths, but also weaknesses. Depending on the requirements your battery has to meet in the respective application, or which properties you want, some battery technologies are more suitable or less suitable.

It is important to weigh up the properties.

How long distances do you usually drive?

How much time does your battery normally have to charge? If your journeys are never shorter than 100 km, this is different from if you regularly only drive distances of 1 - 2 km. The alternator charges the battery with a steady, low current. It takes some time to compensate for the high current drain at the start.

It is difficult to predict how long this will take with your vehicle and your driving style. However, we recommend choosing a battery that starts well even when partially discharged and that has good charging characteristics, i.e. it recovers the current quickly, especially for short journeys.

If you mainly drive short distances, we have compiled some information about what happens in the battery and how you can prevent this: What is sulfation and what can you do about it.

Do you drive your vehicle regularly, only seasonally or only occasionally?

Some batteries are only used seasonally - those in classic cars, motorcycles, boats, jet skis or snowmobiles, but also in certain utility, security or clearance vehicles.

If a battery is installed in a vehicle that is not used for a long time, it will lose its voltage. This can have various reasons:

  • Self-discharge of the battery
  • Leakage currents
  • Silent consumers

You can find out how to counteract this in our tips for the winter or summer break.

If the battery does not work reliably even after a very short standstill (a few days), we recommend that you check it thoroughly. We have compiled tips on how to do this here:

-[Detect what's wrong with the battery from the outside](popup://wissen:optical_check_frame).

-[Test like the pros](popup://wissen:test_step_by_step)

If the battery is left standing for a very long time and if it remains in a discharged state for too long, sulfation can occur, a typical "stand damage".

We recommend GEL batteries with low self-discharge for seasonal use. Or batteries based on AGM technology, which still deliver high cold start currents even when partially discharged.

For passenger cars and commercial vehicles with long standing times, batteries with low self-discharge, a high starting power and good charging behavior such as intAct Premium-Power are the right choice.

Is there a lot of engine vibration in your vehicle?

Especially in trucks and other high-displacement commercial vehicles with diesel engines, there are strong vibrations that cause the battery to age prematurely. Our truck batteries in SHD versions are vibration resistant according to V3, like the intAct Start-Power NG Truck, or V4, like the intAct Premium-Power Truck.

But also in heavy passenger cars like SUVs and off-road vehicles the performance of the battery can suffer from the mechanical vibrations and shocks.

AGM batteries offer a good option here with the glass fibre separators: in the Optima Redtop, the wound plates pressed into the battery housing provide additional protection for the active material, and in the Odyssey starter batteries, the tightly layered, precisely fitted plates made of 99.99 % pure lead.

Another option for both cars and trucks is the intAct Start-Stop-Power EFB (Enhanced Flooded Battery). This further developed flooded battery is also particularly vibration-resistant.

Does your vehicle need to start reliably even in extreme cold?

If your business relies on your diesel car or four-wheel drive off-road vehicle, your fleet of trucks or your commercial vehicles such as construction machinery, agricultural machinery or security vehicles starting under all conditions, you need particularly high cold start performance. AGM batteries, such as the Optima Redtop or the Odyssey starter batteries, deliver a lot of power quickly, even if they are no longer fully charged.

Do you want your battery to power loads even when the engine is off?

For example, lights and radio while you bridge the time until the next appointment as a field worker, wait for passengers as a driver or spend the night in the driver's cab (onboard living)?

When the engine is not running, all the power for the electrical consumers comes from the battery. You may know this when the car won't start in the morning because the lights or radio were on overnight. Batteries with good charge acceptance ensure that the state of charge rises enough, even during short trips, that the battery can deliver light, heat, and entertainment while waiting or resting. Because they also have good current output, they still start reliably even when partially charged. Alternating between charging while driving and discharging during rest or idle times stresses batteries differently than just starting them. They must be more resistant to cycling. The load and the requirements are comparable to those in a start-stop vehicle. Especially EFB batteries, like the intAct Start-Stop-Power EFB, which have been developed for the use in start-stop systems, are therefore also a good choice for this application. If power-hungry consumers such as coolers or hi-fi systems are also to be supplied, we recommend using a powerful dual-purpose battery such as the Optima Redtop or an Odyssey starter battery or installing an additional supply battery.

Is your old-timer, classic or vintage car your pride and joy and should this be seen and felt under the bonnet?

Classic car batteries like the intAct Oldtimer-Power provide the necessary power to start heavy classic engines and convey this value also in their appearance.

You don't like maintenance?

With low-maintenance batteries you should check the fluid level approx. every 3 months and refill with distilled water if necessary. You can recognize them by the vent caps on the top, as with some intAct Start-Power types or intAct Oldtimer-Power.

If you want to save yourself this work, we recommend that you choose a maintenance-free or absolutely maintenance-free battery. Both require no maintenance, but the underlying technology is different.

Modern starter batteries like the intAct Race-Power and intAct Premium-Power are maintenance-free. Due to the calcium alloy and special designs, less gas is produced in the battery, which condenses in the labyrinth of the closed lid and runs back into the circuit. The intAct Start-Stop-Power EFB is also a low-maintenance battery.

Absolutely maintenance-free starter batteries are mostly AGM-based. They are sealed and equipped with a pressure relief valve. They are also called VRLA batteries, i.e. valve-regulated lead-acid batteries. No liquid is lost here.

Maintenance-free batteries are often cheaper than absolutely maintenance-free ones.
On the other hand, absolutely maintenance-free AGM starter batteries can be used well for dual-purpose applications in which starting and supplying are required in equal measure.

If you want to learn more about starter batteries, take a look at our knowledge section. There you will find information about typical damage to starter batteries and how you can recognize and avoid it - so that you can enjoy your battery for as long as possible.