Bosch S4 car batteries are a high quality, premium replacement for you original car battery. The Bosch S4 range has up to 15% more \'Cold Cranking\' power than the original equivalent, and up to 20% longer service life thanks to Bosch\'s innovative \'Power Frame\' technology. All Bosch S4 batteries are maintance free meaning you do not need to top up, or change the water. Bosch S4 car batteries are ideal for modern vehicles which require a higher quality battery