Overvoltage protection, cell degradation protection, overcurrent protection, constant-voltage protection, short circuit protection, temperature control, equipped with advanced battery management system (BMS). Including the PSE inspection of the Japanese Standards [safety standards of global standards], ISO9001, various safety standards of the world criteria, such as UN38.8, have passed the quality test. In addition, temperature testing, shock testing, wear testing, such as implementing a drop test, it seeks a thorough safety.