Description: 21700 4S1P 14.4V 4Ah li-ion  flashlight battery Product No.: HG4AE4936 Cell model: 21700/4000mAh/3.6V Battery Specification: 4S1P/4000mAh/14.4V Nominal voltage: 14.4V Nominal capacity: 4000mAh Charging voltage: 16.8V Charging current: 2000mA Discharge current: 800mA Maximum discharge current: 25A Discharge cut-off voltage: 10.8V Internal resistance : ≤ 100m Ω Delivery voltage: 13.2-15.6V Battery weight: 365g Product size: 84* 56mm (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: 4S1P Lithium Battery protection: Short circuit protection,overcharge protection,over discharge protection,over current protection, etc Application field: Outdoor lighting, flashlight