Test/review of LG 21700 M50T 5000mAh (Gray)

LG 21700 M50T 5000mAh (Gray)







Official specifications:

  • Nominal energy: 18.20 Wh

  • Minimum energy: 17.60 Wh

  • Minimum capacity: 4850mAh

  • Nominal voltage: 3.63V

  • Standard charging current: 1,455A

  • Max charging current: 3.395A

  • Charging voltage: 4.2V

  • Charge interrupt current: 50 mA

  • Max discharge current: 7.275A

  • Switch-off voltage: 2.5V

  • Weight: 68 ± 1 g

  • Protected: No.

  • Rechargeable: Yes

  • Dimensions: 21.1mm x 70.2mm



This is a high capacity 21700 cell with about 5000mAh, the cell is not for high current.








The two cells are well matched.























Conclusion

This is a very good high capacity cell, but I got slightly less capacity compare the M50.



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

Thanks HKJ! Do you happen to know what the ‘T’ or lack thereof denotes?

No

LG M50 looks somewhat similar to Vapcell 21700 5000 mAh, that is a rewrap of the Tesla 21700. Maybe the “T” in M50T denotes Tesla version of the cell :laughing:

Actually, that is a possibility, knowing that Tesla contracted LG Chem for the Model 3 production in China.

@HKJ, what kind of material is the cell casing made of?

The discharge curves of the M50 and M50T look identical, except that the M50T has less capacity.

Some sort of metal, sorry I am not a metallurgy expert.

Of course. But is the casing attracted to a magnet?

It do and quite well.

Actually I doubt it. Because, according to the 10A discharge curve of M50T, it seems to release considerably more heat than the old 21700 Tesla / Vapcell battery. At least there must be another reason why they choose that battery instead.

Thanks anyway.

Just found a small bug in the battery comparator, Henrik. When this cell is selected at the right side, its 2A discharge curves appear red colored (!) instead of blue:

Turd. :-D

I wonder how that happened, anyway a regeneration of the data fixed it.

T stand for Tianjin, China
LG chem tianjin factory

Just check the M50 and M50T datesheet is not the same :weary:

Thanks!