Gpower 18650 2600mAh (Yellow-black)
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Official specifications:
- Capacity: 2600mAh
- Maximum Continuous Discharge Current: 25A
- MAX Discharge Current: 40A
- Nominal Voltage: 3.7V
- Voltage at end of Discharge: 2.5V
- Material: Li-ion
- Length: 65.30mm
- Diameter: 18.20mm
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According to specification they are modern high current cells.
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These curves do not looks good, one cell is 2800mAh and the other 2300mAh.
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One cell reach 80°C and the other 86°C at 20A.
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At 30A they get a bit warmer, but due to thermal delay I do first measure it after I have stopped the discharge.
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One of the cells cannot handle 15A, before it is warm and this test do not give it time to warm up.
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Conclusion
I do not like these cells, they are very different. The B cell has most capacity, but need to be warm before it can deliver high current.
As 2600mAh 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