Test/review of GTF NCR18650B 3400mAh (Green)

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HKJ
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Test/review of GTF NCR18650B 3400mAh (Green)

GTF NCR18650B 3400mAh (Green)
DSC_6804
Official specifications:


  • Cell Type: Li-ion
  • Battery type: NCR18650B
  • Capacity: 3100-3400 mAh
  • Voltage: 3.7V
  • Size: Ø18mm x 65 mm
  • Weight: About 48g

GTF%20NCR18650B%203400mAh%20(Green)-info
This 18650 battery uses a type number and wrap color for a Panasonic 18650 3400mAh battery.
DSC_6803
DSC_6805 DSC_6806
DSC_6807
DSC_6808
DSC_6809
GTF%20NCR18650B%203400mAh%20(Green)-Capacity
The two cells do not have the same capacity, it is not that surprising when the specifications says 3100-3400mAh. The can deliver 5 to 7A
GTF%20NCR18650B%203400mAh%20(Green)-Temp-5.0
GTF%20NCR18650B%203400mAh%20(Green)-Temp-7.0
GTF%20NCR18650B%203400mAh%20(Green)-Temp-10.0
GTF%20NCR18650B%203400mAh%20(Green)-CapacityTimeHours
GTF%20NCR18650B%203400mAh%20(Green)-CapacityTime
GTF%20NCR18650B%203400mAh%20(Green)-Energy
GTF%20NCR18650B%203400mAh%20(Green)-PowerLoadTime
GTF%20NCR18650B%203400mAh%20(Green)-TripCurrent
GTF%20NCR18650B%203400mAh%20(Green)-Charge
GTF%20NCR18650B%203400mAh%20%28Green%29-Pulse-1A-10-10-2.5V-IR
Conclusion
The cells are not bad cells, but due to the mismatch I will not recommend using them in series.
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
Graphical comparison to 18650 and other batteries
Table with all tested LiIon batteries

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

toobadorz
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Interesting, these are some China cells wrapped with Panasonic-like shrinking skins. They are not really bad, however they are not Panasonic cells either. You can even buy some exactly the same skins and make your own Big Smile

DominikM
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LitoKala NCR18650B were the same last year. Now they are closer to 3,0Ah Silly

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DavidEF
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Well, according to the comparator, they seem to outperform Panasonic NCR18650B by a small amount. It’s a shame the tested cells above had a mismatch. Otherwise, they seem to be a decent cell from a manufacturer I hadn’t heard of.

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Barkuti
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From the perspective of someone which at times builds some battery pack, seeing so large cell differences sort of gives me the creeps.

The above penta-leg cell top is afaik used by BAK.

I think such large differences among cells are due to rewrapper's bad business practices. They may have cells in stock from different manufacturing batches or even slightly different models. What a bunch of bunglers… 

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Superstocker
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Thanks HKJ! Stuff like this is always very helpful to know.

DavidEF
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Barkuti wrote:

From the perspective of someone which at times builds some battery pack, seeing so large cell differences sort of gives me the creeps.

The above penta-leg cell top is afaik used by BAK.

I think such large differences among cells are due to rewrapper's bad business practices. They may have cells in stock from different manufacturing batches or even slightly different models. What a bunch of bunglers… 

Well, I don't know, because I'm not very well educated about different cells. But take the fact that the cells are mismatched even a little, along with the fact that they used a Panasonic-esque wrapper, and I'm probably never going to buy these cells. I can't trust them a little, so I won't trust them at all. But, as I said above, it's a shame really. They really look like decent cells in the testing. And in the comparator, they actually seem to outperform the Panasonics by a little.

The Cycle of Goodness: “No one prospers without rendering benefit to others”
- The YKK Philosophy