Test/Review of Samsung INR18650-29E 2900mAh (Blue)

Batteries and Chargers Rechargeable Batteries
1

Samsung INR18650-29E 2900mAh (Blue)



Official specifications:

  • Nominal Capacity: 2,850mAh (0.2C, 2.50V discharge)
  • Typical Capacity: 2,850mAh (0.2C, 2.50V discharge)
  • Minimum Capacity: 2,750mAh (0.2C, 2.50V discharge)
  • Charging Voltage: 4.20 ± 0.05 V
  • Nominal Voltage: 3.65V (0.2C discharge)
  • Charging Method: CC-CV (constant voltage with limited current)
  • Charging Current: Standard charge: 1,375mA
  • Charging Time: Standard charge: 3hours
  • Max. Charge Current: 2750mA (not for cyclelife)
  • Max. Discharge Current: 2,750mAh (continuous discharge), 8250mAh (not for continuous discharge)
  • Discharge Cut-off Voltage: 2.50V
  • Cell Weight (max. (g): 48g
  • Cell Dimension: Diameter(max.) : 18.40 mm, Height(max) : 65.00 mm,
  • Operating Temperature: (Cell Surface Temperature) Charge: 0 to 45°C, Discharge: -20 to 60°C
  • Storage Temperature: 1 year : -20~25°C, 3 months : -20~45°C. 1 month : -20~60°C




This cell has a rather low maximum current, to get the maximum life of the battery, but it is possible to draw high current peaks.



The cell capacity does change with load, except when the cell gets warm.
The cell has same type of discharge curves as other high capacity cells, i.e. the voltage drops all the time, it does not have a plateau.


















The cell is not rated for high current, but it can deliver, at least for a short time.





Conclusion

Being Samsung it is a very good cell, performance is good, but not anything special.



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

2

Thanks for good review!

I have a question about measured capacity.

How measured capacity at 3A is lower than measured capacity at 5A?

As far as I knew, more increase it’s test current more decrease it’s measured capacity. But this battery doesn’t follow normal battery data spec. Is it just a cell deviation or there other story I didn’t know?

Thanks
Kim.

3

It is due to heat, when the battery gets warm the chemical processes runs faster and it can better deliver the energy.

If you look at my reviews, you will see it frequently.