The Bosch S4 EFB series represents a perfect balance between reliability and advanced performance, crafted to meet the increasing demands of modern vehicles. Designed with Enhanced Flooded Battery (EFB) technology, this series is tailored for cars with start-stop systems and other energy-intensive functions. The S4 EFB range offers extended cycle life, improved charge acceptance, and stable performance under frequent starts and stops. Bosch’s reputation for German engineering excellence is reflected in these batteries, which are optimized for durability, safety, and dependable power delivery in daily driving conditions.
One of the most prominent models in this series is the Bosch S4 E11. With a capacity of 80 Ah and a cold cranking current of 730 A, it is engineered to deliver strong and consistent starting power, even in colder climates where batteries are often put to the test. Measuring 315 mm in length, 175 mm in width, and 190 mm in height, this battery matches the L4 European standard size. Its design makes it a suitable drop-in replacement for a wide range of European vehicles, particularly mid-size and larger cars that require both high starting power and resilience to frequent cycling. The layout (0), terminal type (1), and B13 hold-down system further ensure its compatibility with various OEM specifications.
Built with EFB technology, the S4 E11 is significantly more resistant to deep discharges than conventional lead-acid batteries. It features a special polyester scrim on the positive plate, which helps to stabilize the active material and minimize degradation from charge/discharge cycles. This structure is particularly beneficial for cars equipped with start-stop systems, regenerative braking, and multiple onboard electronics, as it supports faster recharge and longer battery life under partial state-of-charge usage. The EFB design also ensures that the battery remains maintenance-free, providing peace of mind for the driver over time.
When compared to similar models in the market, the Bosch S4 E11 stands shoulder to shoulder with some of the most trusted names in automotive batteries. For instance, the Exide EL800 offers slightly less cranking power at 720 A but is otherwise nearly identical in size and specification. The Lucas LE115 mirrors the S4 E11 in every key detail, including its 80 Ah capacity and 730 A output. Varta’s F22 also matches the Bosch model almost exactly, while the Varta N80 slightly edges ahead with a more powerful 800 A output — though all these batteries share the same dimensions and are equally suited for the same vehicle types.
What sets the Bosch S4 E11 apart is its exceptional build quality and long-term reliability, backed by one of the most trusted brands in automotive technology. For drivers looking to maintain their vehicle’s performance with a battery that can handle the electrical demands of modern driving, the S4 E11 is an excellent and dependable choice. Its compatibility with European cars, strong performance metrics, and EFB durability make it one of the most balanced options for those seeking both quality and long service life.