Vorsicht 21700 4000 mAh 3 Ventile

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Rutzki73
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Vorsicht 21700 4000 mAh 3 Ventile

Beitragvon Rutzki73 » Fr 2. Feb 2018, 07:15

Habe heute durch Zufall entdeckt, dass einige der 21700 auf dem Markt mit 4000 mAh auf eine Zelle von Lishen aufbauen.

Bei Mooch sind die u.a. als Basen und CoilArt "rausgeflogen" :lol:

Dabei hat die Zelle 3 Ventile am Plus-Pol, hat 4000 mAh...aber nur 3C (12A)

Lishen_LR21700SA.jpg
Lishen_LR21700SA.jpg (29.67 KiB) 3592 mal betrachtet


So gesehen sind sogar die NCR20700B von Sanyo robuster und leistungsfähiger.
Lügen haben kurze Beine, nur Willi lügt nie!

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shadockan
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Re: Vorsicht 21700 4000 mAh 3 Ventile

Beitragvon shadockan » Fr 2. Feb 2018, 23:20

I did a test on a Basen and I stated from the beginning that it is a 15A battery.
That's what I saw ...
The 20A that support some, rather it delivers without temperature limitation ...

Personally with 20A I got 2000+ mAh.

Without any specific reason, however, I had the suspicion that it must be Lishen's construction ...
I do not know how and why I had this suspicion ...

On discharging 10 A, however, it is a good battery.
I was watching continuously ± 3900mAh.

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Joergl
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Re: Vorsicht 21700 4000 mAh 3 Ventile

Beitragvon Joergl » Fr 2. Feb 2018, 23:44

Taschenlampenbatterie. :idea:

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shadockan
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Re: Vorsicht 21700 4000 mAh 3 Ventile

Beitragvon shadockan » Fr 9. Feb 2018, 08:37

Not necessary .
With low resistors in mechanical mod, theoretically it will not be the best, but in an electronic mod with demand of up to 30 - 40 Watts has a good duration.

Until we see in the market the strong 21700 of the big ones
(Samsung, Sony, Pana / Sanyo), batteries of companies like this are a solution ...

But I do not see interest from LG.
I had read somewhere that the 20650, is for a single customer.
Today they are also on the market.
Is LG preparing some 21700 battery ????????

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Rutzki73
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Re: Vorsicht 21700 4000 mAh 3 Ventile

Beitragvon Rutzki73 » So 11. Feb 2018, 09:05

LG and Sony are about to bring their own batteries in this size into the market. LG Chem concentrate according to some information I got mainly on their automative cells: http://www.lgchem.com/global/vehicle-ba ... l-PDEB0001
If it is true, what man hears, or read, LG Chem works already with some big known car manufacturer, so I don´t know, if the 21700 is their top priority at this point of time.
Regarding Sony...heard they had some quality problems and therefore had to postpone the entry into the market.
By the way, also Samsung SDI had to postpone their entry with 21700.
To Chinese made 21700 - one can see on the one hand, that Chinese manufacturer are always a bit faster, but on the other hand, their quality can not compete with Panasonic, LG, Sony and Samsung. The Lishen 4000 mAh is specified with 3C, so if there is a battery with 3750 mAh it would not be more than 3.5C-4C to my opinion.
As soon as we would be able to test and compare 21700 from the big four with the Chinese ones, we would be able to see, how over rated the existing ones are (like iJoy).
I don´t mind to use, or to recommend Chines-made batteries, finally Lishen Tianjin and BYD are examples for good Chinese manufacturer of Li-Ion cells, but...I´d like to see technical documentation (Data sheets) of the manufacturer, or that Rebranded batteries can tell me, what hides behind their sleeves.
Lügen haben kurze Beine, nur Willi lügt nie!

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shadockan
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Re: Vorsicht 21700 4000 mAh 3 Ventile

Beitragvon shadockan » Mo 12. Feb 2018, 22:05

You ask too much from the Chinese Ratzki ...
You, of course, can ask for it and they do it ....
But publicly displaying datasheets ...., I think it's not easy ...

For LG, I knew that too.
For electric vehicles.

If Sony really pulls out 21700 5000mAh, I think the rest will follow ...
For us ... it's good ...


Of course, Chinese constructions are not compared to the constructions of ..... fantastic four (five with Sanyo).
Alternative need you can name their use only.

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Rutzki73
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Re: Vorsicht 21700 4000 mAh 3 Ventile

Beitragvon Rutzki73 » Di 13. Feb 2018, 08:03

Actually I have a stomach feeling, that all manufacturer have some quality problems with the new size of 21700.

Many years the tendency was to make cell smaller and more powerful, because the biggest demand was all those 5V devices from the consumer electronics.

All of a sudden we have big demand to big batteries and size is not that important anymore. Till now (beginning of 2018) we don´t have a single cell on the market in flow production, just big OEM´s get those batteries and they are mostly modified to their usages.

It seems like the challenge to manufacture in 20700, or 21700 is not that simple and that it will take some more time.
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shadockan
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Re: Vorsicht 21700 4000 mAh 3 Ventile

Beitragvon shadockan » Mi 28. Mär 2018, 18:04

It's natural to take time.
I really think size 20700 was a ..... experiment ..... in fact.
Since the demand for 21700, manufacturers will look at this direction.

OEM will not try to build anything superior to major manufacturers.
It will look to get market share, until the big manufacturers come out on the market.

I have even noticed that Lishen's construction has a sluggish performance somewhere at 3.5 Volts.
Which reminds me of batteries from older generations.
This makes me think that technology and manufacturing style is not similar to that of 21700 new batteries from major manufacturer
(how could it be the same ...).




As for the smaller size ... but with more capacity and more efficient batteries, no one knows ...
They may already have them ready, but not given them on the market .....


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