Test/review of Gpower 18650 2500mAh (Yellow-black)

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HKJ
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Test/review of Gpower 18650 2500mAh (Yellow-black)

Gpower 18650 2500mAh (Yellow-black)
DSC_6938
Official specifications:


  • Capacity: 2500mAh
  • MAX Discharge Current: 35A
  • CDR (Continuous Discharge Current): 20A
  • Voltage: 3.7v
  • Material: Li-ion
  • Length: 65.30mm
  • Diameter: 18.20mm
  • Top: Flat top(18mm 65mm)

Gpower%2018650%202500mAh%20(Yellow-black)-info
Medium capacity high current cells.
DSC_6931
DSC_6940 DSC_6941
DSC_6942
DSC_6943
DSC_6944
Gpower%2018650%202500mAh%20(Yellow-black)-Capacity
These curves do not looks good, one cell is 2800mAh and the other 2300mAh.
Gpower%2018650%202500mAh%20(Yellow-black)-Temp-15.0
Gpower%2018650%202500mAh%20(Yellow-black)-Temp-20.0
One cell reach 74°C and the other 88°C at 20A.
Gpower%2018650%202500mAh%20(Yellow-black)-Temp-30.0
At 30A they get a bit warmer, but due to thermal delay I do first measure it after I have stopped the discharge.
Gpower%2018650%202500mAh%20(Yellow-black)-CapacityTimeHours
Gpower%2018650%202500mAh%20(Yellow-black)-CapacityTime
Gpower%2018650%202500mAh%20(Yellow-black)-Energy
Gpower%2018650%202500mAh%20(Yellow-black)-PowerLoadTime
Gpower%2018650%202500mAh%20(Yellow-black)-TripCurrent
One of the cells cannot handle 15A, before it is warm and this test do not give it time to warm up.
Gpower%2018650%202500mAh%20(Yellow-black)-Charge
Conclusion
I do not like these cells, they are very different. The B cell has most capacity, but need to be warm before it can deliver high current.
As 2500mAh high current cells they are bad.
The GPower 2600mAh cells have the same difference, are they mixed up? According to the labels on the cells no, but it looks like Gpower may have swapped the labels on some of them. If they had been paired correctly they would be rated better.
Notes and links
The batteries was supplied by gpower-battery.com for a 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

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

hIKARInoob
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The third set you have tested with same results. Ain’t nuthin’ but a G-thang baby.

Barkuti
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Wow! What a mess! Facepalm

Mooch, from the E-CigaretteForum, reviewed these cells quite recently too. Seems he didn't got wrap-mixed pairs:

 

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hIKARInoob
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Two loc’ed out G’s so we’re crazy!