Samsung ICR18650-30B 3000mAh (Green)

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Official specifications:
Note the charge voltage, it is +/-0.03 volt tolerance, not the usual +/-0.05 volt.

Test with 4.35 volt charging

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.35V-info

These cells are high capacity cells with moderate current capability. The higher voltage means more energy.

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Samsung%20ICR18650-30B%203000mAh%20(Green)%204.35V-Capacity

The discharge curves looks nice, good tracking and nearly constant capacity. The cell has a little trouble with the 7A track, it heats up a bit and this improves the performance.

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.35V-CapacityTimeHours

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.35V-CapacityTime

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.35V-Energy

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.35V-PowerLoadTime

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.35V-TripCurrent

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.35V-Charge



Test with 4.3 volt charging

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.3V-info

Reducing the charge voltage to 4.30 volt means losing about 100-150mAh.

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.3V-Capacity

The slightly lower voltage makes the discharge curve be more load independent.

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.3V-CapacityTimeHours

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.3V-CapacityTime

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.3V-Energy

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.3V-PowerLoadTime

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.3V-TripCurrent

Samsung%20ICR18650-30B%203000mAh%20(Green)%204.3V-Charge


Test with 4.20 volt charging

Samsung%20ICR18650-30B%203000mAh%20(Green)-info

At 4.2 volt charging the loss is about 400mAh compared to 4.35 volt.

Samsung%20ICR18650-30B%203000mAh%20(Green)-Capacity

The independence of load is also present at 4.2 volt.

Samsung%20ICR18650-30B%203000mAh%20(Green)-CapacityTimeHours

Samsung%20ICR18650-30B%203000mAh%20(Green)-CapacityTime

Samsung%20ICR18650-30B%203000mAh%20(Green)-Energy

Samsung%20ICR18650-30B%203000mAh%20(Green)-PowerLoadTime

Samsung%20ICR18650-30B%203000mAh%20(Green)-TripCurrent

Samsung%20ICR18650-30B%203000mAh%20(Green)-Charge



Conclusion

This cell has a more flat discharge curve than some high capacity cells, this means higher voltage at the last part of the discharge at any charge voltage. The initial part of the discharge will be higher when charged from 4.35 volt (only at low loads).

It is a very good cell, but requires a 4.35V charger for best performance.



Notes and links

For 4.35 volt chargers check my chargers reviews, Xtar has a some: WP2h, VP2, SP1.

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