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

18650 3.7V 1800mAh Flat Head Rechargeable Lithium Battery

1. Electrical Characteristics

• Nominal Voltage: 3.7V
• Nominal Capacity: 1800mAh (1.8Ah)
• Energy: 6.66Wh
• Internal Resistance: ≤ 60mΩ (depending on brand and quality)
• Cycle Life: ≥ 500 cycles (up to 70% of original capacity after 500 cycles)

2. Charging Parameters

• Standard Charge Current: 0.5C (0.9A)
• Max Charge Current: 1C (1.8A)
• End of Charge Voltage: 4.2V ± 0.05V
• Charge Cut-Off Current: 0.01C (approximately 18mA)

3. Discharge Parameters

• Max 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 Specifications

• Operating Temperature:
  • Charge: 0°C to 45°C
  • Discharge: -20°C to 60°C
• Storage Temperature:
  • Short term (less than a month): -20°C to 50°C
  • Long-term (over a month): -20°C to 25°C

5. Physical Characteristics

• Size: Diameter: 18mm, Length: 65mm
• Weight: Approximately 42g
• Flat Head Design: No protruding positive terminal (ideal for battery packs)

18650 3.7V 2600mAh Flat Head Rechargeable Lithium Battery

1. Electrical Characteristics

• Nominal Voltage: 3.7V
• Nominal Capacity: 2600mAh (2.6Ah)
• Energy: 9.62Wh
• Internal Resistance: ≤ 50mΩ
• Cycle Life: ≥ 500 cycles (with up to 80% retention)

2. Charging Parameters

• Standard Charge Current: 0.5C (1.3A)
• Max Charge Current: 1C (2.6A)
• End of Charge Voltage: 4.2V ± 0.05V
• Charge Cut-Off Current: 0.01C (around 26mA)

3. Discharge Parameters

• Max 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 Specifications

• Operating Temperature:
  • Charge: 0°C to 45°C
  • Discharge: -20°C to 60°C
• Storage Temperature:
  • Short term (under a month): -20°C to 50°C
  • Long-term (over a month): -20°C to 25°C

5. Physical Characteristics

• Size: Diameter: 18mm, Length: 65mm
• Weight: Approximately 47g
• Flat Head Design: Ideal for battery packs without a protruding positive terminal