Description

Technical Details:

About This Product:

The Bosch S4021 is a high-performance, maintenance-free car battery designed for vehicles without Start & Stop systems. With a 45Ah capacity, 330A cold-cranking current, and 12V output, it delivers reliable starting power and consistent energy for everyday driving.

Equipped with the patented PowerFrame® grid, it ensures optimized current flow, reduced corrosion, and an extended service life. The battery features a double-lid labyrinth design that minimizes water loss by returning condensed water, making it absolutely maintenance-free.

Safety is enhanced with double backfire protection and integrated central degassing. Measuring 238 × 129 × 227 mm with left-right positive polarity, the Bosch S4021 is compact, durable, and ideal for a wide range of vehicles. Always verify vehicle compatibility before installation and remove the transport plug from degassing holes prior to use.