Note: The battery belongs to dangerous goods. It has strict requirements on transportation and packaging. Delivery period is about 15-20 days. If you have time requirement, don't buy it. Thank you for your patience and understanding. Features: Rechargeable protection/discharge circuit. Operation reoccurs low cist, short circuit and current protection. safe and environmentally friendly. Suitable for flashlight or electronic tool. Store in a dry, cool place. Specifications: Model: 18650 capacity: 19800 mahvoltage: 3.7 vchemical: Li-ionsize: 65mm (length) x 17mm (dia.) product Name: 18650 chargingfeatures: 4 slots independent charging product weight: 106 grammod power supply: normal USB power supply input voltage: DC 5v 1-2aoutput voltage: DC 4.2V 1000mA