Lithium

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

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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
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1800mAh, 2600mAh

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