thunderheart
Member
- Joined
- Apr 4, 2018
- Messages
- 276
Hi guys!
People usually buy these cells for their capacity/price ratio and 10A max discharge current.Queen Batterysells NCR18650PF for $2.35 and MG1 for $2.20 (shipping not included).
As always, and the tests were done usingZKETECH EBC-A20, which supports up to 20A discharge, 4-wire measurement and is PC-connected.
I'm still stuck with the v2.5 of my battery holder which is going to be upgraded to v3.0 soon. I've ordered some copper parts from China but haven't got them yet[img=15x15]https://endless-sphere.com/forums/images/smilies/icon_sad.gif[/img]Russian logistics sucks...
I've followed all the prescriptions of the IEC61960-2003 standard concerning battery's capacity measurement. Before each discharging cycle each battery was charged at standard current mentioned in its datasheet to charge end voltage (4.2V) (cut-off at 0.1A, which is the lowest supported by EBC-A20). Before each discharging or charging i've held a1-1.5hrs pause. The environment temperature was about 25C. To be sure in results i've done each testminimum twice.
Panasonic NCR18650PF
This cell was marked C AV 7522 where C is the rank and 7522 is the production date code (7-2017 5-May 22)
I've found a plenty of official datasheets for this cell across the web with different Std charge current ratings (1925mA, 1,35A, 1375mA). 1.375A was mentioned in two of 4 datasheets so i chose that current.
The main specs from the most completedatasheet:
Rated capacity:2700mAh at 20C
Minimum capacity:2750mAh at 25C
Typical capacity:2900mAh at 25C
Nominal voltage:3.6V
Standard charge current:1.375A
Charge end voltage:4.2V
Charge cut-off current:100mA
Max. discharge current:10A
Discharge cut-off voltage:2.5V
AC impedance at 1KHz:?35m?
Maximum weight:47g
My sample's measured weight is 46.23g
DC internal resistance at full charge is 26-29mOhm
Test results:
More than 2950mAh at 0.2C discharge and almost 2800mAh even at 10A - great performance. Nothing to add.
LG 18650 MG1
This guy's marking is LGGBMG11865 P265I214N2 where P265 is the manufacturing date (P-2016, 265th day of the year - Sep 22)
The main specs from itsdatasheet:
Minimum capacity:2750mAh
Nominal capacity:2850mAh
Nominal voltage:3.62V
Standard charge current:1.425A
Max. charge current:2.85A
Charge end voltage:4.2V
Charge cut-off current:50mA
Max. discharge current:10A
Discharge cut-off voltage:2.5V
AC impedance at 1KHz:?35m?
Weight (approx.):46g
My cell weighs 44.78g
DC internal resistance at full charge is 30-33mOhm
Test results:
Just look at these curves! How beautiful they are! At 0.2C MG1 showed almost 2850mAh and at 10A - almost 2700mAh.
COMPARISON
At 2A:
Both cells go equal up to the middle then MG1 starts slowing down. At the finish NCR18650PF has 324mWh more than MG1
At 5A:
The same thing goes here - NCR18650PF outruns MG1 by 436mWh
At 8A:
The difference is 421mWh in favor of NCR18650PF. Look at the curves in the beginning - MG1's curve is more linear.
At 10A:
The picture doesn't change much - NCR18650PF gives out 363mWh more than MG1.
CONCLUSION
Obviously Panasonic NCR18650PF is the winner but
1. it was manufactured later than MG1
2. Despite the lower capacity MG1 curves i liked more
3. MG1 is a bit cheaper which will result in a good economy when buying 100 or more cells.
I hope this test was interesting to read/watch and useful for you Here is thevideo version of this review:
P.S. Your likes, comments and subscriptions are highly appreciated!
People usually buy these cells for their capacity/price ratio and 10A max discharge current.Queen Batterysells NCR18650PF for $2.35 and MG1 for $2.20 (shipping not included).
As always, and the tests were done usingZKETECH EBC-A20, which supports up to 20A discharge, 4-wire measurement and is PC-connected.
I'm still stuck with the v2.5 of my battery holder which is going to be upgraded to v3.0 soon. I've ordered some copper parts from China but haven't got them yet[img=15x15]https://endless-sphere.com/forums/images/smilies/icon_sad.gif[/img]Russian logistics sucks...
I've followed all the prescriptions of the IEC61960-2003 standard concerning battery's capacity measurement. Before each discharging cycle each battery was charged at standard current mentioned in its datasheet to charge end voltage (4.2V) (cut-off at 0.1A, which is the lowest supported by EBC-A20). Before each discharging or charging i've held a1-1.5hrs pause. The environment temperature was about 25C. To be sure in results i've done each testminimum twice.
Panasonic NCR18650PF
This cell was marked C AV 7522 where C is the rank and 7522 is the production date code (7-2017 5-May 22)
I've found a plenty of official datasheets for this cell across the web with different Std charge current ratings (1925mA, 1,35A, 1375mA). 1.375A was mentioned in two of 4 datasheets so i chose that current.
The main specs from the most completedatasheet:
Rated capacity:2700mAh at 20C
Minimum capacity:2750mAh at 25C
Typical capacity:2900mAh at 25C
Nominal voltage:3.6V
Standard charge current:1.375A
Charge end voltage:4.2V
Charge cut-off current:100mA
Max. discharge current:10A
Discharge cut-off voltage:2.5V
AC impedance at 1KHz:?35m?
Maximum weight:47g
My sample's measured weight is 46.23g
DC internal resistance at full charge is 26-29mOhm
Test results:
More than 2950mAh at 0.2C discharge and almost 2800mAh even at 10A - great performance. Nothing to add.
LG 18650 MG1
This guy's marking is LGGBMG11865 P265I214N2 where P265 is the manufacturing date (P-2016, 265th day of the year - Sep 22)
The main specs from itsdatasheet:
Minimum capacity:2750mAh
Nominal capacity:2850mAh
Nominal voltage:3.62V
Standard charge current:1.425A
Max. charge current:2.85A
Charge end voltage:4.2V
Charge cut-off current:50mA
Max. discharge current:10A
Discharge cut-off voltage:2.5V
AC impedance at 1KHz:?35m?
Weight (approx.):46g
My cell weighs 44.78g
DC internal resistance at full charge is 30-33mOhm
Test results:
Just look at these curves! How beautiful they are! At 0.2C MG1 showed almost 2850mAh and at 10A - almost 2700mAh.
COMPARISON
At 2A:
Both cells go equal up to the middle then MG1 starts slowing down. At the finish NCR18650PF has 324mWh more than MG1
At 5A:
The same thing goes here - NCR18650PF outruns MG1 by 436mWh
At 8A:
The difference is 421mWh in favor of NCR18650PF. Look at the curves in the beginning - MG1's curve is more linear.
At 10A:
The picture doesn't change much - NCR18650PF gives out 363mWh more than MG1.
CONCLUSION
Obviously Panasonic NCR18650PF is the winner but
1. it was manufactured later than MG1
2. Despite the lower capacity MG1 curves i liked more
3. MG1 is a bit cheaper which will result in a good economy when buying 100 or more cells.
I hope this test was interesting to read/watch and useful for you Here is thevideo version of this review:
P.S. Your likes, comments and subscriptions are highly appreciated!