4 Advice to Choose a INR21700

I saw on Nkon a new battery :

Check now

https://eu.nkon.nl/rechargeable/li-ion/--size/lg-m50lt.html

Is this a new version of the LG 50T ?

The price is correct (less than 4') and they indicate a 14.60 A discharge current.

I did not find a review for this model, any info ?

Many subvariants were available in the LG 'M50'production line. The first 'M50' was rated for 500 cycles (LG product spec info) with relatively high IR, then comes M50T with only 300 cycles (LG product spec info) and the same IR. The latest subvariant I know is 'M50L' and 'M50LT' which should deliver cycles (rumors) and ca 30% lower IR. M50LT is very good cell in its category and now it is available at an interesting price. You can check the results of ongoing cycle life tests on another discussion forum.

I do not have datasheet for LG M50 'L' line, only for older M50 model and then for M50T. The info about cycles was released by some distributors and of course LG has to compare the offer with the competition, where for example the original Samsung 50E model was also rated for 500 cycles only, but the newer 50G version already has cycles in its datasheet.

Jaro'welcome to BLF!

Do you have an idea of how much current your scooter draws? Important to know that if possible.

I would think you might need a cell with higher current deliver (a high drain cell) like the Samsung 40T or Molicel P42A. They list with capacities of around mAh but they are able to give more juice where the cells you listed will suffer from higher voltage drop and reduced capacity when asked to provide more amps. The Sofirn mAh battery (black wrapper but not the version) is about the same, good cell. Generally the cells that state the highest mAh capacity for a given cell size can't provide quite as much current, sometimes it matters, sometimes it doesn't, but if they are worked hard you and don't fall flat on their faces, they may only end up giving you the same capacity as the high drain cell anyway.

Sony/Murata also has a good if you find that one available (the Samsung and Moli are a little better).

JOINSUN Product Page

Mooch reviewed these and mentioned the following

'The top contact metal is also thinner than most cells and the 'legs' coming down from it are narrow so I recommend not using this cell where there is a lot of pressure on the top contact.'

I'm guessing that these will be no good for flashlights, unless you add a solder blob or a button to reinforce it. Dropping the flashlight has a very high chance of denting it in.

They are rated for cyles when the recommended 4.10 charge voltage is used. Theres nothing new here other than how they were rated lol. Or if it is better it will be hard to compare to cells tested previously at the usual 4.2 without doing your own tests.

I got some for a lr60 nitecore camping light so hopefully should last me a weekend camping for the next decade.

A draft data sheet is posted here and mentions the reduced voltage to use to get the extra cycles.

Heres some gumpf that im sure most people know but that mentions how most cells go from 300/500 to 600/ cycles at 4.1v

LG M50LT is currently probably the best cell in the HE category in terms of cycle life. In general, LG production can be relied on in this parameter, regardless cylindrical or pouch design. On the other hand, most of the competition is not far behind.

You can check results of cycle life test for community at another forum.

Ok so what cycles does it get when charged to 4.2v like every other manufacturer/spec sheet. Then you can make a decent comparison. Im sure everyone else will soon be jumping on the 4.1 boat soon though lol

Hello everyone,
Long time reader, first post however.

I am building myself a Cargo fat bike with a long range capacity, and I just want a second opinion on a few things.
First of all, I got my hand on 200 Samsung INR- 50E, and I was planning on making myself a long range cargo bike with it in a 52V battery.
https://www.thunderheartreviews.com//01/samsung-50e-capacity-test-mah-or-not.html
https://zeroair.files.wordpress.com//11/samsung-inr--50e.pdf

So, 14x14=196 = Wh of energy in 12.6Kg of Battery.
All of that, powered by a Bafang G510.

Now, my first question would be, Considering that the charge voltage is of 4.2V and that the cut-off is at 2.5V, I was considering limiting the charge and the cutoff by the BMS at 57.4V and 37,8V (4,1V & 2,7V) Which would still let me around Wh of battery to play with.


Would it be right, or am I just wrong ?

john61ct said: I would stop discharge lots earlier.

0.1Vpc might only be 10% capacity but triple your lifespan cycles.

need to use resting voltage for apples to apples

This is why I am aking for opinions, I really want to make sure to chose the good Lvc.
What is the resting voltage exactly ?

goatman said: id go 4.15v to 3.0v with settings but try not to go below 3.2v while riding. whats the continuous amps?

Oooooh, I see my mistake now
Looking at the graph below, I see how I misunderstood it..
SO yeah, a LvC at 3.2 and a switch to allow a little extra to 3.05 would be a great idea.

The batterie setup is going to be 14s14p 50,2V and the controller used in the engine is the standard Bafang Ultra, which can suck up to 30amps continuous.
But I should be doing around 50v 10-20A most of the days I think, unless I really plan for a hard route (which will come too)

markz said:

goatman said: id go 4.15v to 3.0v with settings but try not to go below 3.2v while riding. whats the continuous amps?

Yeah that would be nice, 4.15V for a top charge and then 3.25V or 3.20V for a low voltage cutoff. What would be even better is to have a switch that will have the ability to go down to 3.00 or 3.05V. The key though is to have enough capacity (Ah) that you never ever really reach LVC for your normal day to day riding and only really reach LVC when your just cruising around aimlessly chilling out and grinning the entire time its that e-grin.

This does sounds like an interesting option, allowing for a little extra in case I empty the battery a little too much.
The rated capacity is of 69Ah (doing the math with 100% capacity) so probably around 64/65Ah with the limiths and cutoff.
So, not 4,1Vpc but 4,15 would be preferable ?

Also, This is also kinda the point of this Battery, I will use it quite a few times at 90% of capacity but I will also use it in my everyday life while only using 10/20% a day.

Andy123 said: Hello Chaadr
The weight of the battery 12,6 kg for 14x14 cells 50E is not possible ( 69x14x14= g) only cells. And we have to add wires, BMS, outer package.
I have 14S6P with Samsung 50E and it is about 6 kg weight battery for Bafang ultra too.

Cut off voltage-Low battery protect:
Biktrix recommends 47 V for stock controller Ultra with 52V battery (14S). It is 3,36 V/cell and this voltage is approx. 15% SOC.

Hello Andy123,
Yes, sorry I made a mistake (actually quite a few) on the weight, And you are right, I meant to say that I have g of cells. The planned estimate for the whole battery was of g without case.

As for the cut off voltage, I am now planning on slowly going from 3,5Vpc to maybe 3,4 (as John61ct stated under) or 3,35.

That's interesting to see that you have a similar setup, how does your battery hold the charge ?
How much do you get out of it ?

john61ct said: 50E are NCA chemistry not LCO.

And highly recommended both for high power density and relatively good longevity under conditions most in other use-case contexts would consider abusive.

Plenty of test reports from expert forum members give objective proof of that, out of hundreds of batteries on the market only a handful come even close.

Thanks, for a second I thought I made a shit choice haha