About this item Suit for the RC Stunt Car - Double-Sided Tumbling Stunt RC Car Remote Control Car Child Toy Car ( DE35 DE38 DE40 DE50 ) Specification - battry 3.7 voltage, 500mAh, L*W*H 3.93*3.14*1.96 inch Everywhere You will Charge It- You can charge the battery on power bank, vehicl power, computer and so on Hight Performance - Designed for high performance RC hobby car.If it is the problem we will change it for you What You Get - 2PCS 3.7V 500mAh Lithium Battery + 1PCS USB cable Product description Description For DE35 DE38 DE40 DE50 Specification:Voltage:3.7V;Capacity:500mAh Product Number :14500.