Samsung Li-Ion 18650 3500mAh Battery (4)

Samsung INR18650-35E 3500mAh (Pink)

DATASHEET

Official specifications:

• Nominal capacity: 3500mAh
• Minimum capacity: 3350mAh
• Nominal voltage: 3,6V – 3,7V
• Charging voltage: 4,2V
• Discharge current: 8A
• Maximum discharge current: 13A
• Charge current: 0,6C 2000mA
• Discharge end voltage: 2,65V
• Pluspol: FlatTop
• Chemistry: LiNiCoAlO2
• Diameter: 18,55mm ± 0,1
• Height: 65,25mm ± 0,15
• Weight: 48g ± 1

This is one of the new high capacity cells.

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).

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

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

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

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