18650 battery manufacturer / supplier in China, offering High Quality 3.7V 200mAh Rechargeable Lithium Battery Pack for Bluetooth Bracelet/Headset, Li Polymer Battery 3.7V 1200mAh Rechargeable Battery for Custom Devices, Factory Customized Lithium Cell 3.7V 180mAh Polymer Lithium Battery for Portable Electronics and so on.