BS or British Standard is the generic term given to high integrity batteries that fully comply with BS6290 part 4 (and IEC60896-2) in terms of construction, performance and design life. Usually costing slightly more than standard sealed lead acid products, they offer 10-12 year design life, threaded copper insert terminals, flame retardent case material (UL94-VO) and are generally selected for premium installations such as Hospitals and Telecommunications.