Tenergy 18650 Protected Lithium Ion Rechargable Battery

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Tenergy 2600 mAh 18650 Lithium Ion Battery

Note: This Button Top Version is most suitable for Flashlights that uses Cylindrical 18650 Li-Ion Cells.

Features and Benefits

  • Li-Ion 18650 cylindrical rechargeable batteries with Internal Voltage protection PCB!
  • Internal PCB protection (patent pending design) prevents under-voltage at 2.5V and over-voltage at 4.25V.
  • 3.7V 2600mAh high capacity for longer runtime
  • Manufactured under ISO9001-2000 to assure quality
  • Battery tested based on International Electrotechnical Commission (IEC) standard to ensure capacity, quality and life time
  • Applications
  • Lighting or other device that needs 3.7V power
  • Building portable power device needing high energy density and low weight


  • CAUTION: when working with Li-ion cells, they are very sensitive to charging characteristics and may explode if mis-handled.
  • User should have enough knowledge on Li-Ion rechargeable batteries in charging, discharging, and assembly before use.
  • Put the batteries in fire-proof container
  • Do not put batteries on wood surface or carpet when charging
  • Never leave battery un-attended when charging
  • We are not responsible for damage of any modification of the batteries in form, shape or made into packs
  • We are not responsible for any damage caused by misuse or mishandling of these Li-Ion batteries

Product Specifications

  • Capacity* Nominal 2600 mAh, Minimum 2500 mAh
  • Internal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.35V. UNIQUE INTERNAL PCB!
  • Dimensions:
    Diameter: 19 mm
    Height: 69.5 mm
  • Weight (Typical) Approx. 50 g
  • Nominal Voltage: Average 3.7V
  • Discharge Voltage: 3.0V
  • Internal Impedance: less or equal to 130 milliohm (with PTC)
  • Cycle Performance: 90% of initial capacity at 400 cycles
  • Cycle life: > 500 cycles
  • Standard Charge Current: 0.2C (Cut-off Current: 0.01C)
  • Fast Charge Current: 0.5C (Cut-off Current: 0.01C)
  • Standard Discharge Current: 0.5C (End Voltage = 2.75V)
  • Max. Discharge Current: 1.5C
  • Internal PCB Specifications:


    Item Content Criteria
    Over Charge Protection Over Charge Detection Voltage 4.325±0.05V
    Over Charge Release Voltage 4.125±0.10V
    Over Discharge Protection Over Discharge Detection Voltage 2.5±0.10V
    Over Discharge Release Voltage 2.9±0.10V
    Rated Operational Current 3.5A
    Over Current Protection Over Current Detection Current 6-8A
    Release Condition Cut load
    Detection Delay Time 8.0~16.0ms
    Short Circuit Protection Detection Condition Exterior Short Circuit
    Release Condition Cut Short Circuit
    Interior Resistance Main Loop Electrify Resistance VC=4.2V; R DS≤40mΩ
    Current Consumption Current Consumption in Normal Operation 4.0μA Type 8.0μA Max
    Dimension (LxWxH) R8.65 x 0.5 mm