Description: 3.6V 3200mAh 18650 Bluetooth Speaker Lithium-ion Battery Product No.: HG1AE3121 Cell model:  LG18650 / 3200mAh / 3.6V Battery Specification: 1S1P / 3200mAh / 3.6V Nominal voltage: 3.6V Nominal capacity:  3200mAh Charging voltage:  4.2V Charging current: 640mA Discharge current: 640mA Maximum discharge current: 3A Discharge cut-off voltage: 2.75V Internal resistance : ≤150mΩ Delivery voltage: 3.6-4.0V Battery weight: 50g Product size: 68 * 19mm (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: Lithium Battery protection: short circuit protection, overcharge protection, overdischarge protection, overcurrent protection, etc. Application field: smart home, small appliances powered by Lithium-ion Battery