Description: 14.4V 3500mAh 18500 B-Ultrasound Machine Lithium Battery Product No.: HG4AE3781 Cell model:  18500 / 3500mAh / 3.6V Battery Specification: 4S1P / 3500mAh / 14.4V Nominal voltage: 14.4V Nominal capacity:  3500mAh Charging voltage:  16.8V Charging current: 1700mA Discharge current: 1700mA Maximum discharge current: 2000mA Discharge cut-off voltage: 11V Internal resistance : ≤400mΩ Delivery voltage: 14.4-16V Battery weight: 150g Product size: 75 * 71.5 * 19.5mm (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: B-Ultrasound Machine, portable medical equipment powered by Lithium Battery