Efest IMR26650 5000mAh (Purple) 2017
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Official specifications:
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Rated capacity: 5000mAh
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Nominal voltage: 3.7V
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Voltage at end of discharging: 2.5V
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Max. charging current: 4A
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Standard charge: 2A
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Discharging current 35A This text is beside a photo of the cell showing 18A on Efest website
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Pulse discharging current: 50A This text is beside a photo of the cell showing 45A on Efest website
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Charging temperature range: 0°C ~ 45°C
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Discharging temperature range: –20°C ~ 75°C
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Inner resistance: 20mOhm
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Cell size: 26.5 (±0.2)mm x 65.2 (±0.2)mm
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A high current 26650 cell with good capacity.
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There is some capacity difference between the cells. They handle up to about 20A without much capacity loss.
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At 20A they get hot.
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And at 30A I had to termiate the discharge due to temperature.
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Conclusion
This cell has good performance at higher currents and a fairly high capacity.
Notes and links
The batteries was supplied by Efest for 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