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Tenergy 30016 18650 2600mAh 3.7V Protected Lithium Ion (Li-ion) Button Top Battery - Bulk

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  • High quality and cost efficient 18650 by the trusted battery makers at Tenergy
  • Ready to use in common devices such as LED flashlights
  • Integrated PCB prevents over charge or discharge, safe to use and charge freely
  • Lasts for up to 500 charge cycles, an excellent value
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1 - 49$7.95 ea.
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100+$7.70 ea.
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Tenergy 18650

3.7V 2600mAh Li-ion Battery

This high energy density and capacity lithium-ion battery from Tenergy is perfect for flashlights, portable power devices or other devices requiring 3.7 volts. The 3.7 Volt 2600 mAh capacity provides a long lasting, efficient discharge for maximum runtime for your flashlight or other device. The lightweight 18650 cell has been tested by the IEC (International Electrotechnical Commission) standard to ensure capacity, quality, and life span, so there are no surprises. Also, this 18650 has been manufactured under the ISO9001-2000 standard to assure top notch quality. These 18650s supply three times the voltage of 1.2V AA NiMH or NiCd rechargeable batteries. The unique patented PCB design prevents voltages outside of 2.5-4.25 volts

Note: These fully protected cells simplify usage with their integrated PCB. Perfect for your single cell application these cells are not for pack building as doing so will defeat the PCB protection which is matched to the correct voltage on a single cell. If you are building a pack please choose one of our other cells and the appropriate PCB.

Features and Benefits
  • Unique and New! With integrated PCB Protection!
  • Lithium Ion 18650 cylindrical rechargeable batteries
  • Button top terminal
  • Internal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.25V.
  • Unique PCB design and patent pending.
  • Higher energy density and lower weight than other types rechargeable batteries
  • Manufactured under ISO9001-2000 to assure quality
  • Battery tested based on International Electrotechnical Commission (IEC) standard to ensure capacity, quality and life time
  • Lighting or other device needing 3.7V power
  • Building portable power device needing high energy density and low weight
Product Specifications:
  • Capacity: Nominal 2600 mAh, Minimum 2450 mAh
  • Internal PCB protection prevents under-voltage at 2.5V and over-voltage at 4.25V.
  • Dimensions:
    • Diameter 18+/-0.2 mm
    • Height 67+/- 0.2mm
  • Weight (Typical) Approx. 46 g
  • Nominal Voltage: Average 3.7V
  • Cut-off Voltage: 2.5V
  • Internal Impedance: less or equal to 180 mΩ (with PTC)
  • Cycle Performance: 90% of initial capacity at 400 cycles
  • Cycle life: > 500 cycles
  • Charge: Current = 0.5C, Voltage = 4.2V, End Current = 0.01 mA
  • Discharge: Current = 0.5C, End Voltage = 3.0V
  • Max. Charging current: 1.5C
  • Max. Discharging current 1.5C (for continuous discharge)
Internal PCB Specifications:
  • Operation Voltage:
    • Minimum: 1.5V
    • Maximum: 10V
  • Excess Charge Detection Voltage:
    • Minimum: 4.2V
    • Typical: 4.25V
    • Maximum: 4.3V
  • Excess Charge Release Voltage:
    • Minimum: 4.0V
    • Typical: 4.05V
    • Maximum: 4.1V
  • Excess Charge Delay Time:
    • Minimum: 61mS
    • Typical: 77mS
    • Maximum: 93mS
  • Excess Discharge Detection Voltage:
    • Minimum: 2.437V
    • Typical: 2.5V
    • Maximum: 2.563V
  • Excess Discharge Delay Time:
    • Minimum: 7mS
    • Typical: 10mS
    • Maximum: 13mS
  • Excess Current Detection Voltage:
    • Minimum: 0.17V
    • Typical: 0.2V
    • Maximum: 0.23V
  • Excess Current Delay Time:
    • Minimum: 9mS
    • Typical: 13mS
    • Maximum: 17mS
  • Short circuit Protection Voltage:
    • Minimum: VDD-1.2V
    • Typical: VDD-0.9V
    • Maximum: VDD-0.6V
  • Short circuit Protection Delay Time:
    • Typical: 5µS
    • Maximum: 50µS
  • Consuming Current:
    • Typical: 3µA
    • Maximum: 6µA
  • Standby Current:
    • Typical: 0.3µA
    • Maximum: 0.6µA
  • Circuit Impedance:
    • Typical: 60µΩ
    • Maximum: 70µΩ
Battery Size:18650
Battery Capacity (mAh):2600
Battery Chemistry:Li-Ion
Battery Voltage:3.7
Battery Terminal Type:Button Top
Battery Shelf Life:3 Years
Warranty:Battery Junction 30-Day Warranty
Return Policy:Battery Junction Return Policy
Product Weight:1.623oz
Product Dimensions:2.73" (L) x 0.709" (Diameter)
Country of Origin:China
Associated Battery Sizes:168A, 18650, 19670, Protected 18650, Unprotected 18650
14 Reviews
57% (8)
14% (2)
21% (3)
7% (1)
0% (0)
By Bill
Good value for the price
December 4, 2019
Very fast delivery.
By Michael
, Springdale, Ar.
Great batteries
September 17, 2018
The batteries are high quality, i have ordered the same before and they have lasted years . Like they are advertised.
By Tom
Charger - battery compatibility
June 29, 2018
Not sure if it's the charger's fault or the batteries fault but the charger seems to be maxed out when this battery is installed for charging. And by maxed out I mean that the charger has the ability to take shorter batteries but this battery appears to be the longest that it accepts and it does not do so very easily. Currently the issue is with customer service complaints at tenergy.
By Glen
Greenville, RI
Great battery
September 17, 2016
Charges quickly and has a long life
  • Charges quickly and long life
By Mike
Rechargeable Heaven
July 12, 2016
Bought these batteries for a new flashlight! I could not be happier with the batteries so far.

Flashlight is brighter with the use of these batteries. I hope they last as long as the charge does!
  • Easy to charge, easy to use!
  • None
1 Question & 1 Answer
from Baltimore MD asked:
October 7, 2014
Will this cell be safe to use in a 3x 18650 light O-light or is it a stand alone single cell design?
1 Answer
Yes, as long as the light light is compatible with Li-ion 18650 batteries.
Submitted by: Customer Service on October 7, 2014

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