Test/review of Sony US21700VTC6A 4000mAh (Green)

HKJ

HKJ

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[size=+3]Sony US21700VTC6A 4000mAh (Green)[/size]

DSC_3747.jpg


Official specifications:
  • Size: 21700
  • Nominal Capacity: 4000mAh
  • Continuous Discharge Rating: 30A (40A with 80° Deg. C temperature cut)
  • Nominal Voltage: 3.6v

Sony%20US21700VTC6A%204000mAh%20(Green)-info.png


This is a 21700 high current cell and it is not really from Sony anymore, Murata has bought the LiIon battery business from Sony.

DSC_3746.jpg


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DSC_3749.jpg


DSC_3750.jpg

DSC_3751.jpg

DSC_3752.jpg


Sony%20US21700VTC6A%204000mAh%20(Green)-Capacity.png


The two batteries are very well matched, but at 30A they have problems with heat.

Sony%20US21700VTC6A%204000mAh%20(Green)-Temp-20.0.png


Sony%20US21700VTC6A%204000mAh%20(Green)-Temp-30.0.png


My thermosensor ran out of batteries and did not stop discharging of the A battery, instead the internal fuse in the battery blow.

Sony%20US21700VTC6A%204000mAh%20(Green)-CapacityTimeHours.png


Sony%20US21700VTC6A%204000mAh%20(Green)-CapacityTime.png


Sony%20US21700VTC6A%204000mAh%20(Green)-Energy.png


Sony%20US21700VTC6A%204000mAh%20(Green)-PowerLoadTime.png


Sony%20US21700VTC6A%204000mAh%20(Green)-TripCurrent.png


Sony%20US21700VTC6A%204000mAh%20(Green)-Charge.png




[size=+3]Conclusion[/size]

This is a good battery and can easily deliver 20A, but at higher current it best to have a temperature cut-out.



[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
Graphical comparison to 18650 and other batteries
Table with all tested LiIon batteries
 
ChrisGarrett

ChrisGarrett

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Thanks! Do you suspect Murata is using Sony’s tooling and technology to make current cells, or are they just buying the SONY name and making them elsewhere?

Chris
 
Last edited:
HKJ

HKJ

Flashaholic
Joined
Mar 26, 2008
Messages
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Location
Copenhagen, Denmark
Thanks! Do you suspect Murata is using Sony’s tolling and technology to make current cells, or are they just buying the SONY name and making them elsewhere?

They got the technology, not the name. But maybe the right to use the name for a limited period, this cell do not have "Sony" on it, but the look is similar to the other VTC cells, including the warning.
 
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