Gpower 18650 3000mAh (Yellow-black)
Official specifications:
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Capacity: 3000mAh
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MAX Discharge Current: 40A
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CDR (Continuous Discharge Current): 20A
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Voltage: 3.7v
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Material: Li-ion
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Length: 65.30mm
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Diameter: 18.20mm
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Top: Flat top(18mm 65mm)
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Warranty: 12 months
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A high capacity high current rated cell.
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This chart is a mess, the two cells has different capacity. At 0.2A A was 2435mAh and B was 2749mAh, neither reach the specified 3000mAh
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Both cells can handle 15A without getting too hot.
/Gpower%2018650%203000mAh%20(Yellow-black)-Temp-20.0.png)
At 20A the B cell gets too hot and I terminate the test.
/Gpower%2018650%203000mAh%20(Yellow-black)-Temp-30.0.png)
The B cell cannot handle 30A, the A cell gets too hot after some time.
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/Gpower%2018650%203000mAh%20(Yellow-black)-PowerLoadTime.png)
/Gpower%2018650%203000mAh%20(Yellow-black)-TripCurrent.png)
/Gpower%2018650%203000mAh%20(Yellow-black)-Charge.png)
Conclusion
I do not like these cells, both are below specifications and they are very different.
As 3000mAh high current cells they are bad.
Notes and links
The batteries was supplied by gpower-battery.com 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