1-16PCS 3.7V 5000mAh 21700 Lithium-Ion Battery A-Class High-Capacity 3C High-Discharge Electric Tool Power Battery EU Duty-Free

INR21700 100% Brand new Original High-quality cells!Battery model: 21700Battery type: Lithium ion batteryNominal capacity: 5000mAhActual capacity: 4900-5300mAhNominal voltage: 3.7VNominal voltage: 3.6VCombination: can be 3s 4s 7s 10s 13s 16s 20s, etcCycle life: 1000 cycles (80% DOD)Charge and discharge: CC/CV 500mAStandard Discharging Circuit: 0.1C ACharging cut-off voltage: 4.20VDischarge cut-off voltage: 2.5VCharging current: 500-2000mAMaximum charging current: 3CFast Discharging Current: 0.5C AMaximum instantaneous discharge current: 5C (≤ 3S)Battery internal resistance: less than 18m ΩCharging temperature: 0~50 ° CDischarge temperature: -20~60 ° CStorage temperature: -20~45 ° CVersion: Flat topWeight: 70± 2gSize: 21 * 70mmDimension: 21*70mm2、 Standard charging method (CC/CV constant current and constant voltage)1. Constant current stage: Charge at 2.5A (0.5C) until the voltage reaches 4.2V2. Constant voltage stage: Maintain 4.2V and stop when the current drops to 0.25A (0.05C)3. Overcharging, reverse charging, and direct charging without a protective board are prohibited