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

Batteries and Chargers Rechargeable Batteries
1

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
2

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

3

No

4

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:

5

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?

6

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

7

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

8

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

9

It do and quite well.

10

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.

11

Thanks anyway.

12

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

13

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

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T stand for Tianjin, China
LG chem tianjin factory

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

15

Thanks!