Sanyo NCR20700B 4000mAh (Red)
/DSC_7594.jpg)
Official specifications:
- Rated capacity: 4000mAH
- Minimum capacity: 4050mAh
- Typical capacity: 4250mAh
- Nominal voltage: 3.6V
- Discharge current: 15A
- Charging voltage: 4.20V
- Standard charging current: 2000mA
- Temperature: Charge: 10°C ~ 45°C, discharge: -20°C ~ 60°C, storage -20°C ~ 50°C
/Sanyo%20NCR20700B%204000mAh%20(Red)-info.png)
This is a new battery size that is slightly larger than the common 18650 cell.
/DSC_7593.jpg)
/DSC_7595.jpg)
/DSC_7596.jpg)
/DSC_7597.jpg)
/DSC_7598.jpg)
/DSC_7599.jpg)
/Sanyo%20NCR20700B%204000mAh%20(Red)-Capacity.png)
The discharge curves for the two cells track nicely.
/Sanyo%20NCR20700B%204000mAh%20(Red)-Temp-10.0.png)
/Sanyo%20NCR20700B%204000mAh%20(Red)-Temp-15.0.png)
/Sanyo%20NCR20700B%204000mAh%20(Red)-Temp-20.0.png)
One of the cells got really hot during the 20A discharge. With the other I probably forgot to place the thermo sensor on the battery.
/Sanyo%20NCR20700B%204000mAh%20(Red)-CapacityTimeHours.png)
/Sanyo%20NCR20700B%204000mAh%20(Red)-CapacityTime.png)
/Sanyo%20NCR20700B%204000mAh%20(Red)-Energy.png)
/Sanyo%20NCR20700B%204000mAh%20(Red)-PowerLoadTime.png)
/Sanyo%20NCR20700B%204000mAh%20(Red)-TripCurrent.png)
/Sanyo%20NCR20700B%204000mAh%20(Red)-Charge.png)
Conclusion
This size has more capacity and slightly higher voltage than 18650, without being much larger.
Being from Sanyo/Panasonic it is a ver good cell.
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
Compare to 26650 and other batteries