BTS 4000 Series Introduction BTS 4000 entered into market in the year of 2008. Now it is one of the most successful and most popular battery testing system in China. Thousands of battery manufacturers, battery research institutes and laboratories use it as their primary testing partner for their various testing activities. BTS 4000 is based on Neware forth generation testing system, EV battery pulse testing, DCIR (direct current internal resistance) testing, Cycle life testing, Rate testing supported. BTS-4000 is now widely used by research institutes, colleges, universities and EV battery manufacturers all around the world.