Bosch S4 EFB

  • Product Information

    S4 EFB technology : For passenger cars with start/stop system

    The S4 EFB (Enhanced Flooded Battery) technology satisfies all requirements that lie somewhere between conventional starter batteries and the S5 AGM.

    The S4 EFB is designed for vehicles with start/stop system. Its deep cycle resistance ensures that sufficient energy is available at all times for restarting the vehicle. Even when a large number of energy consumers are in operation in the vehicle during the stop phase, it maintains its excellent starting performance.



    • Longer service life and double the deep cycle resistance of conventional starter batteries
    • More reliable starting even in extreme temperatures and with a large number of electrical devices
    • Outstanding charge acceptance and good resistance to short-haul operations
    • With additional polyester scrim between plate and separator
    • Leak-proof and tilt-resistant up to 55°
    • First-class quality from Bosch
    • Absolutely maintenance-free

  • Technology

    EFB technology: Performance that exceeds standards


    In EFB technology, the positive plate is coated with so-called polyester scrim. This gives the active material additional grip on the plate. Deep cycle resistance is then greater than in traditional batteries, and the battery also remains ready for operation when subject to strong vibrations.

    Bosch batteries at a glance: Suitable for all systems

    If battery replacement is needed, it is important to install EFB batteries again in passenger cars that were fitted with this type of battery when new. Otherwise, the function and positive effects of the start/stop system would be impaired. The battery service life would also be reduced.

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