Tested at 10A-25A constant current. Cells were purchased from Orbtronic and donated for testing.
Dropbox - lg he4 20a 2500mah 18650 wrap.jpeg
Dropbox - lg he4 20a 2500mah 18650 can.jpeg
Dropbox - lg he4 20a 2500mah 18650 top.jpeg
Dropbox - lg he4 20a 2500mah 18650 bottom.jpeg
Disclaimer
Testing cells at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved and how to minimize them. My safety precautions are the ones I have selected to take and you should not assume they will protect you if you attempt to do any testing. Do the research and create your own testing methods and safety precautions.
Bottom Line
A true 20A continuous discharge current (CDR) cell that runs a bit hot at 20A.
Has a bit lower voltage under load and less capacity than the Samsung 25R when pushed hard.
Test Results
Dropbox - lg he4 20a 2500mah 18650 constant-current tests.bmp
Comments
Dropbox - lg he4 20a 2500mah 18650 wrap.jpeg
Dropbox - lg he4 20a 2500mah 18650 can.jpeg
Dropbox - lg he4 20a 2500mah 18650 top.jpeg
Dropbox - lg he4 20a 2500mah 18650 bottom.jpeg
Disclaimer
Testing cells at their limits is dangerous and should never, ever, be attempted by anyone who has not thoroughly studied the dangers involved and how to minimize them. My safety precautions are the ones I have selected to take and you should not assume they will protect you if you attempt to do any testing. Do the research and create your own testing methods and safety precautions.
Bottom Line
A true 20A continuous discharge current (CDR) cell that runs a bit hot at 20A.
Has a bit lower voltage under load and less capacity than the Samsung 25R when pushed hard.
Test Results
Dropbox - lg he4 20a 2500mah 18650 constant-current tests.bmp
Comments
- Good capacity and maximum temperature of 82°C at 20A. This is about 4°C hotter than the Samsung 25R but shouldn't affect cycle life too much versus the 25R.
- Five additional cycles at 20A showed only 0.9% loss in capacity and almost no voltage sag. A 10A discharge done after this though showed a 2.1%% loss in capacity. This is slightly higher than what happens in the 25R and could be explained by the HE4's slightly higher temperature when discharged hard.
- The HE4, to 3.2V at 20A, has about 15% less capacity than the Samsung 25R.
- The HE4 has a slightly lower voltage under load than the Samsung 25R.
- While operating any cell at its rated maximum current causes damage to the cell, I would expect decent cycle life from the HE4 at 20A.
- A discharge at 25A brought the cell temperature to 92°C and dropped the voltage considerably. That's too hot and will significantly speed up the damage done to the cell. This is a 20A cell.
- See my blog for more information on the testing procedures, equipment used, and links to all my test results.
Last edited: