Vehicles equipped with start-stop systems place significantly greater demands on the starter battery, requiring a unit capable of withstanding repeated charge and discharge cycles without degradation. The Bosch S4E EFB (Enhanced Flooded Battery) L4034 is engineered specifically to meet these demands, offering dependable cranking performance and cycle durability for modern passenger cars and light commercial vehicles operating under urban driving conditions.
Bosch developed the S4E range using Enhanced Flooded Battery technology, which incorporates a polyester scrim on the positive plate to reduce active material shedding and extend cycle life compared to conventional flooded batteries. This construction supports the regenerative braking and start-stop functionality found in many current vehicles, delivering consistent power recovery and cranking reliability across the battery's service life.
The L4034 is rated at 12V with a capacity of 105Ah (C20) and a Cold Cranking Amp (CCA EN) rating of 800A. Physical dimensions are 330mm × 174mm – 240mm (L × W × H including terminal), and the unit weighs 23.7kg. Terminal placement follows configuration 9 (positive terminal right), with a Type 1 terminal post and B01 hold-down specification. No direct cross-reference codes are supplied; fitment should be verified against vehicle manufacturer data prior to installation. The product label should be consulted to confirm start-stop compatibility for the specific application.
The Bosch S4E range is available in multiple capacities to suit a broad range of vehicle applications. Related variants within the S4E family include SKUs S4E08, S4E10, S4E11, S4E13, S4E41, and S4E42, as well as the LE002 and L4027 within the wider L4 product group.
The L4034 is supplied with a 2-year warranty, providing assurance of reliable performance under everyday driving conditions.
Standard delivery: 1–3 working days within UK mainland. 30-day returns.
Key Feature:
- Backed by a 2 Years Warranty-year warranty for dependable service life and reliable performance under everyday driving conditions.
- Product Group: 2622, BOSCH STARTER (L4) BATTERY, engineered to deliver consistent starting power and steady performance in demanding automotive applications.
- Engineered as a 1 12.0 battery, ensuring consistent current flow, strong cranking power, and stable voltage delivery.
- Manufactured by Bosch, a German engineering leader delivering advanced technology and durable performance in modern vehicles.
- Weighs 23.7 kg (52.2 lb), balancing high capacity with manageable handling for easy fitting and routine maintenance.
- OEM-style design ensures perfect terminal alignment, secure fitment, and support for both standard and start-stop vehicle systems.
Compatibility:
Engineered for leisure and recreational vehicles, offering deep-cycle discharge capability and sustained energy delivery for extended off-grid power during camping or seasonal travel use.
Uses:
- Restores dependable starting for vehicles that require consistent, everyday performance in regular driving conditions.
- Suited to 1 battery applications, delivering steady operation for vehicles with start-stop or accessory-heavy systems.
- Supports stable electrical output for ignition, lighting, infotainment, and critical onboard electronics in all environments.
- Performs reliably across short commutes and longer journeys where consistent restarts and electrical stability are essential.
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PartsForMachines is a premier e-commerce platform, founded in 2019 in Warwickshire, UK, specialising in aftermarket parts and services for construction, agriculture, and industrial machinery. We offer an extensive catalogue of over 500,000 products. Standard delivery: 1–3 working days within UK mainland. We are proud to be an authorised distributor, giving customers extra confidence when purchasing genuine products from us. In addition, we provide a 30-day return policy for eligible items.
Fitment Warning:
You must check your current battery against the specifications of this battery before ordering to ensure that this is the correct battery for your vehicle. Check battery technology, dimensions, terminal type, polarity, capacity (AH) and cranking performance (CCA). We cannot guarantee correct fitment under any circumstances.