CHEAP NEW ORIGINAL 18650 BATTERY CELLS AND PACKS

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tumich   100 W

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Re: CHEAP NEW CELLS 18650 LG 2850mAh 2,87$ EACH!

Post by tumich » Sep 25 2014 4:25am

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Last edited by tumich on Sep 20 2015 5:18pm, edited 1 time in total.
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Cheap, new, oryginal li-ion cells 18650 up to 3500mAh --> viewtopic.php?f=31&t=61608

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Re: CHEAP NEW CELLS 18650 LG 2850mAh 2,87$ EACH! 115$-11Ah/3

Post by Dudeofdoom » Sep 29 2014 7:11am

Quick testimonial 2:

I've also received mine and there very nice and well packed :-)

DoD

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Re: CHEAP NEW CELLS 18650 LG 2850mAh 2,87$ EACH! 115$-11Ah/3

Post by dougWA » Sep 30 2014 1:27am

The website does little for me as I cannot read it. I am interested though

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ridethelightning   1 MW

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Re: CHEAP NEW CELLS 18650 LG 2850mAh 2,87$ EACH! 115$-11Ah/3

Post by ridethelightning » Sep 30 2014 3:20am

just google LG 18650 MG1. the specs are on the aliexpress sites....

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grrga   10 µW

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Re: CHEAP NEW CELLS 18650 LG 2850mAh 2,87$ EACH! 115$-11Ah/3

Post by grrga » Oct 06 2014 4:56am

Quick testimonial 3:

I've also received my cells. Everything is OK.
Today I'm going to do a discharge test with 2.5, 5, 7.5 and 10A.
I can make a graph of discharge and attach it here.

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riba2233   1 MW

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Re: CHEAP NEW CELLS 18650 LG 2850mAh 2,87$ EACH! 115$-11Ah/3

Post by riba2233 » Oct 06 2014 5:18am

That would be great! :D
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bzhwindtalker   1 MW

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Re: CHEAP NEW CELLS 18650 LG 2850mAh 2,87$ EACH! 115$-11Ah/3

Post by bzhwindtalker » Oct 06 2014 5:38am

I tested quickely on my bike with 4p 20s, big sag above 50 but it is perfectely normal for those cells. Still push well ;) will test capacity later with lower C

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Re: CHEAP NEW CELLS 18650 LG 2850mAh 2,87$ EACH! 115$-11Ah/3

Post by ridethelightning » Oct 06 2014 6:18am

with only 4p i wouldnt be expecting anything different :D but i spose that was just for testing perposes?

im waiting for some 200cells in the post right now, id be using atleast 10p id say, that way they wouldnt get such a thrashing and perhaps last a bit longer...

btw.sorry, is that 50A load you speak of, or kph?

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Re: CHEAP NEW CELLS 18650 LG 2850mAh 2,87$ EACH! 115$-11Ah/3

Post by silicium » Oct 06 2014 2:03pm

I ordered and received 120 cells.
Missing 40% of the connections between cells for each of the 3 packs received. I will soon make a test of ability (when I have assembled the cells as 8P11S and as 4P8S
RH205, A123 4P12S with BMS http://vae-tech.forumactif.org/t8-un-bms-home-made (in french)

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Re: CHEAP NEW CELLS 18650 LG 2850mAh 2,87$ EACH! 115$-11Ah/3

Post by grrga » Oct 11 2014 1:05pm

I made a few discharge tests with small discharge currents.
Start battery voltage: 4,2V
End of discharge: 3,0V

Here are the results:

Image

For a few days I will do tests with higher discharge current.

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grrga   10 µW

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Re: CHEAP NEW CELLS 18650 LG 2800mAh 2,87$ EACH! 115$-11Ah/3

Post by grrga » Oct 12 2014 12:53pm

Discharge test with higher discharge current.

Start battery voltage: 4,2V
End of discharge: 3,0V

Here are the results:

Image

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ridethelightning   1 MW

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Re: CHEAP NEW CELLS 18650 LG 2800mAh 2,87$ EACH! 115$-11Ah/3

Post by ridethelightning » Oct 12 2014 2:38pm

thanks for the testing.

very useful. looks like these cells are good if you have plenty in paralelle :D

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riba2233   1 MW

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Re: CHEAP NEW CELLS 18650 LG 2800mAh 2,87$ EACH! 115$-11Ah/3

Post by riba2233 » Oct 12 2014 2:48pm

It looks just a little worse than panasonic pf and samsung 29E:

http://www.dampfakkus.de/akkuvergleich. ... akku6=&a=5

However they give more Ah at lower currents than samsung ones.

Also, look at this:

Image

Yeah...
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Re: CHEAP NEW CELLS 18650 LG 2850mAh 2,87$ EACH! 115$-11Ah/3

Post by x-speed » Oct 12 2014 3:20pm

grrga wrote:I made a few discharge tests with small discharge currents.
Start battery voltage: 4,2V
End of discharge: 3,0V
Very interesting data. The cell is not on dampfakkus and lygte-info - just the LG MH1.

Some points and questions:
More informative would perhaps be a stop at 2.7V or 2.5V (usual: "“Standard Discharge” shall consist of discharging at a constant current of 570mA to 2.5V." )
At 3.0V the curves are still rather flat! Particularly with higher currents you do not see the real content so.
The LG MG1 / MH1 as most NCA/NMC cells do not (as LG D1 or UR-FM or LiPo's ; click) have that flat curves, which fall off sharply below 3.1V . They are designed for 2.7V typical BMS undervoltage stop.

The vertical distances (->"voltage sag") between the curves look rather irregularly spaced, though constant current steps of 1A or 0.5A . Is that really due to cell properties? How defined and how constant is the charge stop condition? What is the charge stop temperature about? (Temperature affects most the state-of-charge a voltage X, current Y).
Is the meter somehow calibrated against multiple multimeters or so - regarding current and voltage?
Is it a 4-point measurement, or are the resistance of the cables/holder/contacts subtracted? or how are the resistances of cables/holder/contacts?

Are the curves made with one and the same cell? starting from the very first cell cycle? Or did you do some 5 formation cycles before? The seemingly very first discharge @ 0.5A still shows that kind of out-of-factory memory effect - a complex shape below 3.6V storage voltage. At the beginning the capacity and the curve form may still change a lot - thus same formation cycles are good before doing comparative voltage sag measurements - and a repetition of the first discharge later or so to check for effects.

Most interesting would be if sb could do some cycling tests finally - like this. But thats a lot of effort ... Measuring at ~ M/3 perhaps is good for testing cycle life - and is near to typical EV currents not too aggressive. M = max charge/discharge rating = 2.9A / 10A for LG MG1. Thus at 1A charge and 3A discharge.

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tumich   100 W

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Re: CHEAP NEW CELLS 18650 LG 2850mAh 2,49$ EACH!115$-11Ah/36

Post by tumich » Oct 15 2014 7:50am

Graph of discharge Panasonic's cells:
Image
Image
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Re: CHEAP NEW CELLS 18650 LG 2800mAh 2,49$ EACH! 99$-11Ah/36

Post by Hummina Shadeeba » Oct 25 2014 8:54pm

how would a 18650 pack compare to something like a HK lithium ion pack for a skateboard? Is the C rating an issue?

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Re: CHEAP NEW CELLS 18650 LG 2800mAh 2,49$ EACH! 99$-11Ah/36

Post by riba2233 » Oct 26 2014 4:16am

It is not if you use high power 18650 cells like sony vtc4 or vtc4, samsung 20r or 25r, or lg he2.
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Re: CHEAP NEW CELLS 18650 LG 2800mAh 2,49$ EACH! 99$-11Ah/36

Post by Hummina Shadeeba » Oct 27 2014 1:05am

i'm interested in using them for a skateboard. Can you simply string any of these together to make 30volts and 5ah or is there more complications necessary? I know how to string my simple HK 2 cell packs together but I'd be stringing many more together to get the same pack. Is there a tutorial on how to make a pack? Or materials people use?


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Re: CHEAP NEW CELLS 18650 LG 2800mAh 2,49$ EACH! 99$-11Ah/36

Post by riba2233 » Oct 27 2014 5:09am

Hummina Shadeeba wrote:i'm interested in using them for a skateboard. Can you simply string any of these together to make 30volts and 5ah or is there more complications necessary? I know how to string my simple HK 2 cell packs together but I'd be stringing many more together to get the same pack. Is there a tutorial on how to make a pack? Or materials people use?
Of course you can! There are many topics on how people connected them.

https://www.endless-sphere.com/forums/v ... ue#p732917
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Re: CHEAP NEW CELLS 18650 LG 2800mAh 2,49$ EACH! 99$-11Ah/36

Post by Hummina Shadeeba » Oct 27 2014 1:25pm

recycling some old laptops sounds great but I'm thinking it'd be hard to find the higher c rating id want on a skateboard with a 6 or 5ah and 30volt pack.

are these batteries safer than typical HK lipo batteries?

I want to get IMR batteries and I think I'll need around 20c for a skateboard. If I charge them all in parallel will I need to use balance leads? Will I need a BMS or the safer cells that have a fuse? I imagine not.

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Re: CHEAP NEW CELLS 18650 LG 2800mAh 2,49$ EACH! 99$-11Ah/36

Post by riba2233 » Oct 27 2014 1:37pm

High rate batteries don't have internal fuse. You can use bms or balancing charger with some kind of low voltage alarm. They are almost 100% safe.
Used laptop cells are around 0.2C rate, so don't even think of them, you need new, high c rate cells, one of those which I listed previously.

If you have 30V pack, which is 8S, you wont be paralleling them each time you charge, so you'll need balancing wires. They will probably stay in balance, but if you discharge them deeply, you should monitor them carefully and balance them before first use.

What current do you need from your pack?
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Re: CHEAP NEW CELLS 18650 LG 2800mAh 2,49$ EACH! 99$-11Ah/36

Post by born2drv » Oct 27 2014 1:56pm

whats the highest voltage configuration that can fit in this battery housing?

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Re: BRAND NEW CELLS 18650 LG 2850mAh 2,49$ EACH! 99$-11Ah/36

Post by ruegnev1967 » Nov 05 2014 12:40pm

I received my battery. The packaging is very well done. Transportation was quick to belgium. The cells are well balanced to 3.6V, I had to redo only two welds.
I am very happy :D

thanks

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Re: CHEAP NEW CELLS 18650 LG 2800mAh 2,49$ EACH! 99$-11Ah/36

Post by Hummina Shadeeba » Nov 05 2014 1:20pm

riba2233 wrote:High rate batteries don't have internal fuse. You can use bms or balancing charger with some kind of low voltage alarm. They are almost 100% safe.
Used laptop cells are around 0.2C rate, so don't even think of them, you need new, high c rate cells, one of those which I listed previously.

If you have 30V pack, which is 8S, you wont be paralleling them each time you charge, so you'll need balancing wires. They will probably stay in balance, but if you discharge them deeply, you should monitor them carefully and balance them before first use.

What current do you need from your pack?
60amps current maybe
But will i need to add balancing wires to every battery including those in series?

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