Test/Review of Vapcell IMR26650 4200mAh (Yellow)

[size=+3]Vapcell IMR26650 4200mAh (Yellow)[/size]


Official specifications:

• Product: Vapcell 26650 4200mAh
• Model: IMR 26650
• Size: 26.2*65.2mm
• Nominal voltage: 3.6V
• Charge voltage: 4.2V
• Max. charge voltage: 4.25V
• Typical Capacity: 4200mAh (0.2C discharge)
• Min capacity: 4100mAh (0.2C discharge)
• top: Flat top
• color: yellow
• weight: 98g max
• Internal Resistance: <20mOhm
• Standard Charge: 1.5A, 4.20 ± 0.05 V, CCCV 100mA cut-off
• Continuous maximum charge current: 4A
• discharge cut-off voltage: 2.5v
• Continuous maximum discharge current: 45A
• Maximum pulse discharge current: 80A
• Operating environment: Charging, 0°C ~ 45°C, Discharging, -20°C~75°C
• Storage environment: -30°C~55°C, storage >3 months: -20°C~45°C

A really high current 26650 cell according to specifications.










The two cells are not exactly equal. What is also obvious is that the cell has problems at higher current and need to warm up before it can deliver and one of the cells failed completely at 30A.















[size=+3]Conclusion[/size]

Not a very impressive cell, it can do 20A if it gets time to warm up, but not 30A and not the rated 45A.



[size=+3]Notes and links[/size]

The batteries was supplied by Vapcell 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

What do you mean by "failed completely"?

Gauss163 said:

What do you mean by "failed completely"?

Click to expand...

If you check the discharge curve for A battery at 30A it falls below 2.8 volt very fast and abrupt where the B battery heats up and recovers some voltage.
According to the logfile I could draw 30A for 14 seconds before the voltage was below 2.8 volt.

Ah, so your test simply terminated when it abruptly dropped almost instantenously from 3.0V to 2.8V. It wasn't clear whether or not that was some catastrophic event that killed the cell. Did you test it afterwards? Is that failure repeatable? Did your IR tests show any difference between the cells?

Gauss163 said:

Ah, so your test simply terminated when it abruptly dropped almost instantenously from 3.0V to 2.8V. It wasn't clear whether or not that was some catastrophic event that killed the cell. Did you test it afterwards? Is that failure repeatable? Did your IR tests show any difference between the cells?

Click to expand...

The "Discharge power" and "Protection test" are both performed after that test and the cell did work at them. There was a difference of 0.008ohm in the IR test, I do not know if that difference was from the overload.