It is strong and high quality. large capacity, safe and durable,Long life can be discharged by charging times Safety and environmental protection High magnification, fast charge and fast release Size of battery :Length 48mm;width 18mm;thickness 16mm.Weight:95g High quality and SUPERIA , extend the playing time . The battery replacement spare part will fit your car or boat After the charging box is powered on, the power indicator light is always red. When the battery is charged, the green light flashes slowly. When the battery is full, the green light is long light. About RC Battery of vehicle, boat or drone, something you should know : 1.The battery replacement to mach rc quadcopter drone , its standard is more higher and stricter . Player should carefully compare your size and weight of battery . If the weight is too heavy , will make the drone can’t fly . If its size is too big , you can’t install it into the drone. 2.RC remote control vehicle car boat ship , these rc toys its standard of battery replacement part .Player can replace it base on his need. Packaging includes: 2PCS 7.4V 550mAh Lithium Battery1PCS 2in1 Charger