The Bosch S4 battery series is an excellent choice for drivers looking for reliable and efficient power sources for their vehicles. These batteries are known for their high-quality construction, durability, and long service life. Bosch S4 lead-acid batteries provide optimal starting performance in various weather conditions and ensure long-term operation. The S4 series includes models suitable for a wide range of vehicles, both passenger and commercial. Thanks to modern technologies such as calcium-calcium (Ca-Ca) alloy, Bosch S4 offers higher resistance to deep discharges and minimizes the risk of capacity loss. The Bosch S40 26 model is one of the popular variants in this series, offering a capacity of 70 Ah and a maximum starting current of 630 A. It is a standard lead-acid battery that works well in vehicles with moderate energy demands. The battery dimensions are 261 mm in length, 175 mm in width, and 220 mm in height, which corresponds to the D26 standard. This size is less common and is mainly used in Asian vehicles such as Toyota or Honda. A significant aspect of this model is the terminal layout type 0, meaning the positive terminal is on the left side when viewed from the front. The Bosch S40 26 is equipped with standard terminal type 1, making it compatible with most European vehicles. A less standard feature is the B01 mounting zone, which is less common than the traditional B13. This means that before purchasing, it is advisable to check if the vehicle has the appropriate mounting system or if an additional adapter will be needed. An alternative to the Bosch S40 26 is the Varta Blue Dynamic E23 battery, which has identical electrical specifications (70 Ah, 630 A) and the same dimensions (261x175x220 mm). Varta is a well-known and trusted brand among drivers, and its Blue Dynamic models offer similar characteristics to the Bosch S4 series—stable performance, corrosion resistance, and good efficiency in various temperatures. In summary, the Bosch S40 26 is a solid choice for users looking for a reliable battery with good starting power and long lifespan. This model is suitable for both European and some Asian vehicles, especially those requiring the B01 mounting type. Before purchasing, it is essential to ensure that the size and mounting type fit the specific car model.