Last updated: June 15th, 2026

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The Bosch S4 battery series is a line of high-quality lead-acid batteries known for their reliability and excellent starting performance. They are designed for a wide range of vehicles – both passenger cars and commercial vehicles. Batteries in this series provide optimal power even in challenging weather conditions and are characterized by long service life. Thanks to modern technologies such as the PowerFrame grid, Bosch S4 batteries offer increased resistance to corrosion and ensure stable electrical parameters throughout their usage period.

The Bosch S40 20 model is a 45 Ah battery with a maximum starting current of 330 A. With dimensions of 238 mm in length, 129 mm in width, and 227 mm in height, it fits the B24 standard, which is more commonly found in Asian vehicles. This battery is an ideal choice for smaller passenger cars and some compact segment models, particularly those manufactured in Japan and Korea.

A key feature of this model is the terminal layout marked as 0, meaning the positive (+) terminal is on the right side. Additionally, the Bosch S40 20 is equipped with type 3 terminals, which are thinner than standard European terminals, a characteristic typical of batteries used in Japanese and Korean cars. It is also worth noting the mounting type – this model uses the less common B0 mounting system, meaning that before purchasing, it is essential to ensure compatibility with the specific vehicle model.

The Bosch S40 20 battery is equivalent to other popular models on the market, such as Exide Excell EB456, Halfords Standard HCB 053, and Varta Blue Dynamic B31. All of these models have similar electrical specifications and share the same B24 standard size (238x129x227 mm), making them interchangeable in many Asian vehicles.

Specifications

Battery specification
Brand	Bosch
Series	S4
Model	S40 20
Battery technology	standard
Capacity	45 Ah
CCA (Cold Cranking Amps)	330 A
Length	238 mm
Width	129 mm
Height	227 mm
Battery layout	0 – positive on the right side
Terminal types	3
Base hold-down	B0

Similar batteries

Battery model	Capacity	CCA	Dimensions	Base hold-down
Bosch S4 S40 20	45 Ah	330 A	238x129x227 mm	B0
Exide Excell EB456	45 Ah	330 A	237x127x227 mm	B0
Halfords Standard HCB 053	45 Ah	400 A	238x129x225 mm	B0
Varta Blue Dynamic B31	45 Ah	330 A	238x129x227 mm	B0

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Frequently Asked Questions about the Bosch S40 20 car battery

What are the main features of the Bosch S4 S40 20 car battery?

The Bosch S4 S40 20 is a maintenance-free, lead-acid battery designed for consistent performance and reliability. It features a capacity of 40Ah and a cold cranking amperage (CCA) of 330A, making it suitable for a wide range of small to medium-sized petrol and diesel vehicles.

Which vehicles are compatible with the Bosch S4 S40 20 battery?

The Bosch S4 S40 20 battery is compatible with many small to medium-sized cars, including popular models from manufacturers such as Vauxhall, Fiat, and Peugeot. Always check your vehicle’s manual or use a compatibility checker to ensure it fits your specific make and model.

What are the dimensions and terminal layout of the Bosch S4 S40 20?

The Bosch S4 S40 20 battery measures 175 mm in length, 175 mm in width, and 190 mm in height. It features a standard terminal layout (UK Type 038) with the positive terminal located on the right-hand side.

How long is the warranty period for the Bosch S4 S40 20 battery?

The Bosch S4 S40 20 comes with a 4-year manufacturer’s warranty, providing peace of mind and protection against manufacturing defects during this period.

Is the Bosch S4 S40 20 battery maintenance-free?

Yes, the Bosch S4 S40 20 is a maintenance-free battery, which means you do not need to check or top up the electrolyte levels during its lifespan.

Can the Bosch S4 S40 20 battery be used for start-stop systems?

No, the Bosch S4 S40 20 is not designed for vehicles equipped with start-stop technology. For such vehicles, it is recommended to use an AGM or EFB battery specifically designed for start-stop operation.

How should I dispose of my old car battery when replacing it with a Bosch S4 S40 20?

Old car batteries should be disposed of responsibly at a recycling centre or through your battery supplier. Many retailers offer a battery recycling service when you purchase a new battery such as the Bosch S4 S40 20.

What are the benefits of choosing a Bosch S4 battery for my vehicle?

Bosch S4 batteries, including the S40 20 model, offer high starting power, reliable performance in all weather conditions, long service life, and are backed by a strong warranty. They are manufactured to high standards, making them a trusted choice for drivers seeking durability and value.