Efest IMR26650 5000mAh (Purple) 2017
%202017/DSC_0322.jpg)
Official specifications:
- Rated capacity: 5000mAh
- Nominal voltage: 3.7V
- Voltage at end of discharging: 2.5V
- Max. charging current: 4A
- Standard charge: 2A
- Discharging current 35A This text is beside a photo of the cell showing 18A on Efest website
- Pulse discharging current: 50A This text is beside a photo of the cell showing 45A on Efest website
- Charging temperature range: 0°C ~ 45°C
- Discharging temperature range: -20°C ~ 75°C
- Inner resistance: 20mOhm
- Cell size: 26.5 (±0.2)mm x 65.2 (±0.2)mm
%202017/Efest%20IMR26650%205000mAh%20(Purple)%202017-info.png)
A high current 26650 cell with good capacity.
%202017/DSC_0321.jpg)
%202017/DSC_0323.jpg)
%202017/DSC_0324.jpg)
%202017/DSC_0325.jpg)
%202017/DSC_0326.jpg)
%202017/DSC_0327.jpg)
%202017/Efest%20IMR26650%205000mAh%20(Purple)%202017-Capacity.png)
There is some capacity difference between the cells. They handle up to about 20A without much capacity loss.
%202017/Efest%20IMR26650%205000mAh%20(Purple)%202017-Temp-15.0.png)
%202017/Efest%20IMR26650%205000mAh%20(Purple)%202017-Temp-20.0.png)
At 20A they get hot.
%202017/Efest%20IMR26650%205000mAh%20(Purple)%202017-Temp-30.0.png)
And at 30A I had to termiate the discharge due to temperature.
%202017/Efest%20IMR26650%205000mAh%20(Purple)%202017-CapacityTimeHours.png)
%202017/Efest%20IMR26650%205000mAh%20(Purple)%202017-CapacityTime.png)
%202017/Efest%20IMR26650%205000mAh%20(Purple)%202017-Energy.png)
%202017/Efest%20IMR26650%205000mAh%20(Purple)%202017-PowerLoadTime.png)
%202017/Efest%20IMR26650%205000mAh%20(Purple)%202017-TripCurrent.png)
%202017/Efest%20IMR26650%205000mAh%20(Purple)%202017-Charge.png)
Conclusion
This cell has good performance at higher currents and a fairly high capacity.
Notes and links
The batteries was supplied by Efest for 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