Description: 3.6V 3500mAh 18650 with USB Flashlight Lithium-ion Battery Product No.: HG1AE1939 Cell model:  Sanyo 18650 / 3500mAh / 3.6V Battery Specification: 1S1P / 3500mAh / 3.6V Nominal voltage: 3.6V Nominal capacity:  3500mAh Charging voltage:  4.2V Charging current: 700mA Discharge current: 700mA Maximum discharge current: 3.5A Discharge cut-off voltage: 3.0V Internal resistance : ≤100mΩ Delivery voltage: 3.6-3.7V Battery weight: 50g Product size: 69.2 * 18.75mm (Max) Operating temperature: Charging temperature: 0-45°C; Discharge temperature: -20-60°C Storage temperature environment: 1month - 20-60 ° C; 3months - 20-45 ° C; 12months - 20-25 ° C Relative humidity: 65 ± 20% Battery structure: 1S1P Lithium Battery protection: short circuit protection, overcharge protection, overdischarge protection, overcurrent protection, etc Application field: portable lighting