The Varley Red Top Motorsport Battery Range from DMS technologies has been the PREMIER choice for the professional and club racing driver for some 60 years and the batteries have evolved over time to meet the changing demands of both motor racing or rally disciplines.The Varley Red Top Motorsport Battery Range from DMS technologies has been the PREMIER choice for the professional and club racing driver for some 60 years and the batteries have evolved over time to meet the changing demands of both motor racing or rally disciplines.