Efest IMR18650 2500mAh (Purple) 2014
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Official specifications:
- Capacity: 2500mAh
- Min. Capacity: 2400mAh
- Nominal voltage: 3,6 - 3,7V
- Charge voltage: 4,20V ±0,05
- Discharge voltage: 2,75V
- Max discharge current: 35A (14C)
- Positive pole: Flat Top
- Protection circuit (BMS): no (unprotected)
- Diameter: 18,40mm ± 0,1
- Height: 65,25mm ± 0,2
- Weight:48g ± 1
- Charging methode: CC-CV
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This is a very high current battery, but the 35A rating might be a bit optimistic.
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These curves shows a very good battery, there is a good tracking between the batteries and not much capacity drop from 0.2A to 20A.
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Conclusion
Usual a battery with unspecified cell will not get better rating than acceptable, but there is no doubt this is a very good cell that is used here.
Notes and links
The batteries was supplied by Akkuteile.de 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