Last updated: June 3rd, 2026

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The Bosch S5 AGM battery series is a top-tier line developed to meet the needs of today’s most technologically advanced vehicles. Designed with AGM (Absorbent Glass Mat) technology, these batteries are optimized for modern cars equipped with start-stop systems, energy recuperation, and high electrical consumption. AGM technology offers superior resistance to charge-discharge cycles, making these batteries ideal for urban driving where frequent starts and stops put additional strain on a vehicle’s electrical system. The S5 AGM range delivers outstanding performance, excellent cold-cranking power, and longer service life, all with zero maintenance. Bosch has built a reputation for engineering excellence, and this series is a true reflection of that legacy.

The Bosch S5A 11 is a powerful and efficient member of this series. With a capacity of 80 Ah and a cold-cranking amperage of 800 A, it ensures reliable engine starts in all weather conditions while maintaining stable performance for onboard electronics. It is particularly suited for larger vehicles such as SUVs, luxury sedans, and diesel-powered cars, especially those equipped with advanced electrical systems and stop-start functions. Thanks to its AGM construction, the S5A 11 is able to handle deep cycling and partial-state-of-charge operation much better than traditional flooded batteries, extending its lifespan significantly in real-world driving scenarios.

In terms of dimensions, the S5A 11 measures 315 mm in length, 175 mm in width, and 190 mm in height. These dimensions place it squarely within the L4 battery size category—a standard European size widely used in mid-to-large vehicles. This ensures compatibility with many OEM specifications and allows for hassle-free installation. The battery also uses a terminal layout of type 0, terminal posts of type 1, and a B13 mounting base, making it a direct replacement for many vehicles originally equipped with AGM batteries in this format.

When compared with similar models, the Bosch S5A 11 holds its own exceptionally well. For example, the Exide EK800 shares the same dimensions and performance (80 Ah, 800 A), while the EK820 offers a slight bump in capacity to 82 Ah. The Varta Silver Dynamic AGM F21 also matches Bosch’s offering almost identically, as does the Lucas Fusion AGM LF115. Halfords’ AGM 115, with slightly longer dimensions at 317 mm, still falls within the acceptable tolerance and offers the same technical specs. What sets the Bosch apart is the brand’s premium reputation, wide availability, and often stronger warranty or OEM approval in German-made vehicles.

Overall, the Bosch S5A 11 is a high-performance battery that meets the most demanding requirements of modern automotive systems. With AGM technology at its core, it ensures superior durability, quick recharge times, and full support for stop-start operation. Whether replacing a worn-out AGM battery or upgrading from a standard flooded model, the S5A 11 offers a future-proof solution for drivers who value reliability, power, and top-tier quality in every journey.

Specifications

Battery specification
Brand	Bosch
Series	S5 AGM
Model	S5A 11
Battery technology	AGM
Capacity	80 Ah
CCA (Cold Cranking Amps)	800 A
Length	315 mm
Width	175 mm
Height	190 mm
Battery layout	0 – positive on the right side
Terminal types	1
Base hold-down	B13

Similar batteries

Battery model	Capacity	CCA	Dimensions	Base hold-down
Bosch S5 AGM S5A 11	80 Ah	800 A	315x175x190 mm	B13
Exide AGM EK800	80 Ah	800 A	315x175x190 mm	B13
Exide AGM EK820	82 Ah	800 A	315x175x190 mm	B13
Halfords Advanced AGM 115	80 Ah	800 A	317x175x190 mm	B13
Lucas Fusion AGM LF115	80 Ah	800 A	315x175x190 mm	B13
Varta Silver Dynamic AGM F21	80 Ah	800 A	315x175x190 mm	B13

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Frequently Asked Questions about the Bosch S5A 11 car battery

What are the main features of the Bosch S5 AGM S5A 11 car battery?

The Bosch S5 AGM S5A 11 is an advanced AGM (Absorbent Glass Mat) battery designed for vehicles with high energy demands, including those with start-stop systems and regenerative braking. It features a capacity of 80Ah, a cold cranking amperage (CCA) of 800A, and enhanced cycle stability for longer life and superior performance.

Is the Bosch S5A 11 battery suitable for vehicles with start-stop technology?

Yes, the Bosch S5 AGM S5A 11 battery is specifically engineered for vehicles equipped with start-stop systems. Its AGM technology supports frequent engine starts and stops, delivering reliable power and improved durability over conventional batteries.

What are the dimensions and weight of the Bosch S5A 11 battery?

The Bosch S5A 11 battery has dimensions of 315mm in length, 175mm in width, and 190mm in height. It weighs approximately 22.6 kg, making it a direct replacement for many OEM AGM batteries in modern vehicles.

Can the Bosch S5 AGM S5A 11 replace a conventional lead-acid battery?

Yes, the Bosch S5 AGM S5A 11 can replace a conventional lead-acid battery in compatible vehicles, especially those with advanced electrical systems. However, it is important to ensure your car’s charging system is compatible with AGM batteries for optimal performance and longevity.

How long does the Bosch S5A 11 battery typically last?

The Bosch S5 AGM S5A 11 battery generally offers a longer service life compared to standard lead-acid batteries, often lasting up to twice as long under similar conditions. Its advanced AGM technology provides high cycle stability and resistance to deep discharges, contributing to its extended lifespan.

What are the benefits of AGM technology in the Bosch S5A 11 battery?

AGM (Absorbent Glass Mat) technology in the Bosch S5A 11 battery provides several benefits, including improved vibration resistance, maintenance-free operation, superior performance in extreme temperatures, and enhanced ability to support vehicles with high electrical demand and frequent start-stop use.

Is the Bosch S5A 11 battery maintenance-free?

Yes, the Bosch S5 AGM S5A 11 battery is completely maintenance-free. Its sealed design prevents electrolyte loss and requires no topping up, offering hassle-free performance throughout its service life.

How should the Bosch S5 AGM S5A 11 battery be disposed of when it reaches the end of its life?

When the Bosch S5A 11 battery reaches the end of its life, it should be recycled at an authorized recycling center or automotive retailer. Proper recycling helps prevent environmental harm and allows for the recovery of valuable materials from the battery.