Aucooma IMR18650 2800mAh (Purple-blue)
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Official specifications:
- Capacity Std. charge / discharge: 2800mAh
- Nominal Voltage Average of Std. Discharge: 3.70V
- Standard Charge: Constant current: 1250mA, Constant voltage: 4.20V, End current(Cut off): 50mA
- Fast Charge: Constant current: 4000mA, Constant voltage: 4.20V, End current(Cut off): 100mA
- Max. Charge Voltage: 4.20V
- Max. Charge Current: 4000mA
- Standard Discharge: Constant current: 500mA, End voltage(Cut off): 2.5V
- Fast Discharge: Constant current: 25000mA, 40000mA, End voltage(Cut off): 2.5V
- Max. Discharge Current: For continuous discharge: 25A, Max discharge: 40A
- Weight Approx.: 47.0G
- Operating Temperature: Charge: 0 ~ 50°C, Discharge: -20~ 75°C
- Storage Temperature: 1 month: -20 ~ 60°C, 3 months: -20 ~45°C, 1 year: -20 ~ 20°C
- Dimension: (D)18.33 ± 0.06mm, (H) 64.85± 0.17mm
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A battery with good capacity and high current ability.
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The discharge curves has very good tracking.
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At 15A the cell gets warm, but not too warm.
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At 20A the temperature is above 80°C
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The temperature at 30A reach about the same temperature as 20A, but my sensor do first see it after the discharge is finished.
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Conclusion
This looks like a good high current cell, but I would be a bit careful with 20A continuous, due to the high temperature.
Notes and links
The batteries was supplied by Aucooma 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