Samsung INR18650-35E 3500mAh (Pink)

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Official specifications:
Samsung%20INR18650-35E%203500mAh%20(Pink)-info

This is one of the new high capacity cells.

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Samsung%20INR18650-35E%203500mAh%20(Pink)-Capacity

The discharge curves has good tracking.
At 15A the B track stops just after 2.3Ah, this is because my battery holder melts (I hope this is fixed now).

Samsung%20INR18650-35E%203500mAh%20(Pink)-Temp-7.0

Samsung%20INR18650-35E%203500mAh%20(Pink)-Temp-10.0

Samsung%20INR18650-35E%203500mAh%20(Pink)-Temp-15.0

15A is definitly too high current for this cell. The cell temperature is above 75C (25C ambient + 50C temperature raise). Logfile says 87C for A cell.

Samsung%20INR18650-35E%203500mAh%20(Pink)-CapacityTimeHours

Samsung%20INR18650-35E%203500mAh%20(Pink)-CapacityTime

On this chart it is obvious how the heat improves the performance at 15A.

Samsung%20INR18650-35E%203500mAh%20(Pink)-Energy

Samsung%20INR18650-35E%203500mAh%20(Pink)-PowerLoadTime

Samsung%20INR18650-35E%203500mAh%20(Pink)-TripCurrent

Due to the melted battery holder I did only do this for one cell.

Samsung%20INR18650-35E%203500mAh%20(Pink)-Charge



Conclusion

The cell looks very good, it has lot of capacity and can handle some current, but I will not recommend it above 10A.



Notes and links

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