Efest IMR18650 3100mAh (Purple) 2016
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Official specifications:
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Typical Capacity: 3100 mAh
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Nominal Voltage: 3.7V
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Discharge End Voltage: 3.0V
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Standard Charging Current: 1.5A
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Charging Voltage: 4.20+–0.05V
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Max Discharging Current: 20A
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High capacity and high current, but the official rating cannot be a continuous rating.
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The cells track very good and has nearly constant capacity up to 15A, but 20A is too much.
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At 20A one cell gets very hot and I shut down, the other dies.
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Conclusion
The batteries are good, but they cannot deliver 20A
Notes and links
The batteries was supplied by Efest for a review.
How is the test done and how to read the charts
How is a protected LiIon battery constructed
More about button top and flat top batteries
Compare to 18650 and other batteries