Suit for: for DE35 DE38 DE40 DE50. For DE35 DE38 DE40 DE50. 2Pcs 3.7V 500mAh batteries + 1 USB cable. OR 4Pcs 3.7V 500mAh batteries + 2 USB cable. OR 8Pcs 3.7V 500mAh batteries + 4 USB cable. Otherwise, it will lead to batteries overheat and result in battery deterioration, burst, balloon or may even cause fire or explosion.
