Test/review of LG 21700 M50 5000mAh (Grey)

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HKJ
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Test/review of LG 21700 M50 5000mAh (Grey)

LG 21700 M50 5000mAh (Grey)
DSC_4597
Official specifications:


  • Nominal Energy: 18.20Wh (5013mAh at nominal voltage)
  • Minimum Energy: 17.60Wh (4849mAh at nominal voltage)
  • Nominal voltage: 3.63V
  • Nominal shipping SOC: 30%
  • Standard charge current: 1455mA (0.3C)
  • Charge cut-off: 4.2V 50mA
  • Standard discharge: 907mA (0.2C)
  • Discharge cut-off: 2.50V
  • Cycle life: 500 cycles to 80% of Wh min.
  • Maximum pulse discharge power: 80W for 10sec
  • Maximum discharge current: 7275mA (1.5C) in temperature range 5°C ~ 60°C

LG%2021700%20M50%205000mAh%20(Grey)-info
This is a high capacity 21700 cell with about 5000mAh, the cell is not for high current.
DSC_4598 DSC_4599
DSC_4600
LG%2021700%20M50%205000mAh%20(Grey)-Capacity
The two cells are well matched.
LG%2021700%20M50%205000mAh%20(Grey)-Temp-15.0
The battery gets fairly warm at 15A
It looks like I have a problem with my temperature sensor.
LG%2021700%20M50%205000mAh%20(Grey)-Temp-20.0
The defect temperature sensor made the B battery fail permanently, it got too hot.
LG%2021700%20M50%205000mAh%20(Grey)-CapacityTimeHours
LG%2021700%20M50%205000mAh%20(Grey)-CapacityTime
LG%2021700%20M50%205000mAh%20(Grey)-Energy
LG%2021700%20M50%205000mAh%20(Grey)-PowerLoadTime
LG%2021700%20M50%205000mAh%20(Grey)-TripCurrent
LG%2021700%20M50%205000mAh%20(Grey)-Charge
Conclusion
This is a one of the best high capacity batteries.
Notes and links
The batteries was supplied by batteridoktorn.se 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

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

Agro
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Actually the highest capacity 21700 up to 10A discharge…which covers most cases of sustained flashlight use. Smile
BTW your table of all cells misses capacity measurements of this at 0.2A.

Thanks HKJ!

Lux-Perpetua
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Maybe Molicel's M50A will match or surpass the LG M50. But Molicel is probably cheating as the M50A's diameter is 21.7mm, i.e. larger than or at least as large as the inner diameter of many battery tubes of 21700 lights. Wink

HKJ
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Agro wrote:
BTW your table of all cells misses capacity measurements of this at 0.2A.

I know, but something went wrong with one of the cells and i do not have a full curve. The table building software excludes data if the two cells in a test do not match.

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

Superstocker
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Thanks HKJ!

wolfdog1226
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Thanks HKJ.

The voltage curves are basically identical w/ the Samsung 50E

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RelakS
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HKJ, what software do you use to draw these diagrams? I haven’t found it on your website even if it is mentioned.

HKJ
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RelakS wrote:
HKJ, what software do you use to draw these diagrams? I haven’t found it on your website even if it is mentioned.

My own software, it used a library called JFreeChart: http://www.jfree.org/jfreechart/
All my tests are saved as CSV files and then I use the above to draw the charts from the CSV files.

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

KevinZA1988
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This looks like the cell I found when I took the wrapping off my Rofis 21700 protected cell. Hmmmmmm….

Acebeam L18, Armytek Prime C1 Pro, Armytek Prime C2 Pro, Armytek Tiara C1 Pro, Astrolux MF01 Mini, BLF Q8, BLF A6, BLF FW1A, BLF FW3A, BLF FW3C, BLF LT1, Convoy L6, Convoy C8+ , Convoy S3, Emisar D4, Fireflies E07, Jaxman E2L, Manta Ray C8.2 long version, Olight S1R Baton II special edition series, S2R Baton II, Olight Baton 3, Olight Warrior Mini, Olight M2R Pro Warrior.

Most of them have been modded! =)

https://photos.app.goo.gl/JaJaDv4V838AEJf39

RelakS
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HKJ wrote:
RelakS wrote:
HKJ, what software do you use to draw these diagrams? I haven’t found it on your website even if it is mentioned.

My own software, it used a library called JFreeChart: http://www.jfree.org/jfreechart/
All my tests are saved as CSV files and then I use the above to draw the charts from the CSV files.

Thank you!
The CSV part is OK, but Excel/LibreOffice does not support more than two Y axis…

shadockan
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Lux-Perpetua wrote:

Maybe Molicel’s M50A will match or surpass the LG M50. But Molicel is probably cheating as the M50A’s diameter is 21.7mm, i.e. larger than or at least as large as the inner diameter of many battery tubes of 21700 lights. Wink

The Moli M50A is a 20A battery. Moli will have less voltage drop … so it will later reach the cut-off point
It is not correct to compare different batteries …..

EasyB
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Just bought a couple of these at imrbatteries for $3.99 each. Seems like a great deal; hopefully they are not really old and degraded.

Edit: just received these and they are actually M50T, just FYI.