18650 3.7V 1800mAh / 2600mAh Flat Head Rechargeable Lithium Battery

18650 3.7V 1800mAh / 2600mAh Flat Head Rechargeable Lithium Battery18650 3.7V 1800mAh Flat Head Rechargeable Lithium Battery1. Electrical CharacteristicsNominal Voltage: 3.7VNominal Capacity: 1800mAh (1.8Ah)Energy: 6.66WhInternal Resistance: ≤ 60mΩ (depending on brand and quality)Cycle Life: ≥ 500 cycles (up to 70% of original capacity after 500 cycles)2. Charging ParametersStandard Charge Current: 0.5C (0.9A)Max Charge Current: 1C (1.8A)End of Charge Voltage: 4.2V ± 0.05VCharge Cut-Off Current: 0.01C (approximately 18mA)3. Discharge ParametersMax Discharge Current: 3C (up to 5.4A)End of Discharge Voltage: 2.5V to 3.0V (manufacturer-dependent)Recommended Continuous Discharge Current: 0.2C – 1C (360mA – 1.8A)4. Environmental SpecificationsOperating Temperature:Charge: 0°C to 45°CDischarge: -20°C to 60°CStorage Temperature:Short term (less than a month): -20°C to 50°CLong-term (over a month): -20°C to 25°C5. Physical CharacteristicsSize: Diameter: 18mm, Length: 65mmWeight: Approximately 42gFlat Head Design: No protruding positive terminal (ideal for battery packs)18650 3.7V 2600mAh Flat Head Rechargeable Lithium Battery1. Electrical CharacteristicsNominal Voltage: 3.7VNominal Capacity: 2600mAh (2.6Ah)Energy: 9.62WhInternal Resistance: ≤ 50mΩCycle Life: ≥ 500 cycles (with up to 80% retention)2. Charging ParametersStandard Charge Current: 0.5C (1.3A)Max Charge Current: 1C (2.6A)End of Charge Voltage: 4.2V ± 0.05VCharge Cut-Off Current: 0.01C (around 26mA)3. Discharge ParametersMax Discharge Current: 3C (up to 7.8A)End of Discharge Voltage: 2.5V to 3.0V (manufacturer-dependent)Recommended Continuous Discharge Current: 0.5C – 1C (1.3A – 2.6A)4. Environmental SpecificationsOperating Temperature:Charge: 0°C to 45°CDischarge: -20°C to 60°CStorage Temperature:Short term (under a month): -20°C to 50°CLong-term (over a month): -20°C to 25°C5. Physical CharacteristicsSize: Diameter: 18mm, Length: 65mmWeight: Approximately 47gFlat Head Design: Ideal for battery packs without a protruding positive terminal SKU: N/A Category: Lithium