New Original LG 21700 5000mAh Cells

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bibo164   10 µW

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New Original LG 21700 5000mAh Cells

Post by bibo164 » Jan 14 2021 8:32am

Hello,

I have a source for BRAND NEW LG INR21700 M50T Cells. They are factory new and have never been used.

I am using them myself and would like to understand if you are also interesten in them? For that please write me a pm or comment how many cells you would order and where you live. From this I can figure out how much demand there is and how I could best sell them to you. Please only write me if you seriously consider buying them.
I live in central Germany and would ship to the EU for now. The price may vary depending on interest/quantity.

The cells are immediately available to me, so once there is enough interest I could start shipping.
These are NOT 18650 Cells, they are slightly bigger 21mm x 700mm!

Special offer for the first 200 cells: 3,79/cell (min 10 cells)
(please provide some feedback on shipping/quality)


LG INR21700-M50T 5000mAH / 7,5 A continuous / 15 A peak
3,99€/cell + shipping
>100 cells 3,89€/cell + shipping
a5fdeb89-a822-49f6-9fe2-87424242cdd0.jpg
a5fdeb89-a822-49f6-9fe2-87424242cdd0.jpg (280.31 KiB) Viewed 356 times
1bdc320a-241c-4b11-878d-dd5885084acc.jpg
1bdc320a-241c-4b11-878d-dd5885084acc.jpg (344.48 KiB) Viewed 356 times
Max. cont. charge current:
0 ~ 25°C 0.3C (1,455mAh)
25 ~ 45°C 0.7C (3,395mAh)

Max. cont. discharge current:
-20 ~ 10°C 0.5C (2,425mAh)
10 ~ 25°C 3.0C (14,550mAh)
25 ~ 55°C 1.5C (7,275mAh)
Last edited by bibo164 on Jan 15 2021 3:43am, edited 1 time in total.

john61ct   100 GW

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Re: New Original LG 21700 5000mAh Cells

Post by john61ct » Jan 14 2021 11:47am

What assurance that they are genuine?

Have you run your own cap tests?

bibo164   10 µW

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Re: New Original LG 21700 5000mAh Cells

Post by bibo164 » Jan 14 2021 1:17pm

I will do proper capacity tests over the weekend and share the results.

There is in fact no guarantee that they are genuine but all the infos I have add up.

I can send send you a couple of cells at a discount for testing and confirming their quality. Please let me know if you are interested.

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Merlin   10 MW

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Re: New Original LG 21700 5000mAh Cells

Post by Merlin » Jan 14 2021 5:36pm

but....beside no heatshrinks and me wondering why they circle around when they are "genuine"...this is the NKON price from a well known international seller company with tax and invoice.

....i mean. you are selling ....private.

if you have a source of 20700 sanyos.....well...than iam in :D

bibo164   10 µW

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Joined: Jan 24 2015 8:38am

Re: New Original LG 21700 5000mAh Cells

Post by bibo164 » Jan 15 2021 3:42am

You are right, so I adjusted the offer with prices for the expected quantities and made a special offer for anyone who wants to check out those cells and give some feedback. Cap tests will follow over the weekend.

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Merlin   10 MW

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Re: New Original LG 21700 5000mAh Cells

Post by Merlin » Jan 15 2021 8:15am

capacity test is nice but what counts is internal resistance. thats the only thing that says something about in relation to capacity.

you can squeeze out maybe 5Ah out of it using just 0.5a current.
but if you have "grade C" cells and discharge them with 7.5A continue they may have only 4Ah.

bibo164   10 µW

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Joined: Jan 24 2015 8:38am

Re: New Original LG 21700 5000mAh Cells

Post by bibo164 » Jan 18 2021 5:43am

Hello,

so here some more infos on the cells:
cell spec.jpg
cell spec.jpg (691.17 KiB) Viewed 140 times
The cells were supposed to end up in these 13S1P packs for a german OEM. Because for whatever reason this project was scrapped so they had to get rid of the already manufactured packs and the rest of the cells. Unfortunately the fully equipped packs were discharged to 0V so they can only be scrapped.
I took one pack apart and equipped it with new cells but the BMS does not come on. If someone thinks he can reverse engineer this BMS please contact me.
13S1P Packs.jpg
13S1P Packs.jpg (5.12 MiB) Viewed 136 times
so I did several Tests with the cells:
1. Internal resistance test: I never measured any value above 60mOhms


2. 5-7A Discharge (maxed out my charger) Result: 4790mAh


3. I configured a 13s1p pack and discharged it through an inverter with 7.5A to 3.35V per cell (inverter cut-off) - Result: 2.52Ah

john61ct   100 GW

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Re: New Original LG 21700 5000mAh Cells

Post by john61ct » Jan 18 2021 1:31pm

The problem is, very difficult to get a "standard" consistent measure of ESIR, without tightly specifying a dozen different conditions.

A pure cap test is always done at super low current rates, 0.01C would be the highest if trying to confirm against the nameplate rating.

This is no verification of "A" vs "B" production runs, that really depends on the reputation of the supply chain.

But assuming they are not counterfeit, at least verifies they are new or at least in good shape, not worn second-hand.

If you start testing for high C-rates without too much voltage drop or heat build-up

that is no longer a cap test, more like the "real C" tests we see members perform to rate brand quality, like ESIR requiring lots of variables to be spec'd and held constant and beyond what most sellers would allow before purchase.
Merlin wrote:capacity test is nice but what counts is internal resistance.

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