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hello need advice and information about 9800mAh cell
#1
hello all member i need advice ,i want to build my first power wall batterie 48v 14kw capacity
but i need advice and helps to build and chose best cell and bms and parts
i saw on aliexpress 3.7v 9800mAh cell it is true value or fake
all helps and advice are welcome thanks
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#2
Fake
Max is around 3400-3600


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#3
18650 cells with current chemical technology can only have an energy density of around 3600mAh max. There are NO 18650 form factor over 3800 for sure.

However, other form factors, like 26650 can have a larger capacity as it's a physically larger cell. https://www.imrbatteries.com/26650-batteries/ Cells up to 4300mAh are listed
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#4
a good quality 18650 will always show the weight of the cell, they are usually over 43 grams. The fake ones never show the weight on the ads, they are usually under 40 grams. The ones that say 9800 mah are sometimes as low as 1000 mah. People who use them in flashlights would be happy with them since they perform ok in that application.

For best results always get the namebrand cells, even used namebrand are still usable in batterypacks. Its all I use. But some namebrands can also be faked. If unsure about a battery run a capacity check on them.
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#5
But proper weight does not guarantee anything. Some fraudulent manufacturers just put in a tiny cell inside the 18650, and fill the rest with sand to adjust the weight.

9800mAh in 18650 format is obviously an impossibility using current technology.
If you're going to order a possibly fake product from aliexpress, state on the order that you're going to capacity test every cell. Threaten that you're going to immediately open a dispute if the cells are not up to specs, or do not arrive on time (beware of fake tracking numbers). Serious manufacturers will have no issue with that - fishy ones will cancel the order. That should hopefully save you some time, nerves and money.
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#6
thank you all for your advice, now someone can advise me a shop to buy online the good cell cells? also give me the list of parts that I will need to build a battery type 14s 48v capacity 14kwh
it is my firt time to try to build
thanks best regard stiplanet
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#7
https://nkon.nl

All depends on where you live?
The Ultimate DIY Solar and build place
YouTube / Forum system setup / My webpage  Diy Tech & Repairs

Current: 10kW Mpp Hybrid | 4kW PIP4048 | 2x PCM60x | 83kWh LiFePo4 | 10kWh 14s 18650 |  66*260W Poly
Upcoming: 14S 18650~30kWh | Automatic trip breakers, and alot more
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#8
Above 3600 fake for 18650.
Other formats could be up to 1000A, probably li iron phosphate
Selling everything at marketplace.
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#9
hello Daromère i live in africa buy from china market is easy and good for me ,like chine onlie store
advice me china shop and the quantity i must to buy , and all accessories i will need thanks
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#10
(10-21-2019, 05:09 PM)stiplanet Wrote: advice me china shop and the quantity i must to buy , and all accessories i will need thanks

I think you are asking for quite a bit. I would suggest you read other threads in the various sections to get an idea of what you need for your build.
100kwh-hunter, completelycharged, bogptrsn And 1 others like this post
Proceed with caution. Knowledge is Power! Literally! Cool 
Knowledge is Power; Absolute Knowledge is Absolutely Shocking!
Certified 18650 Cell Reclamation Technician

Please come join in general chit-chat and randomness at Discord Chat (channels: general, 3d-printing, linux&coding, 18650, humor, ...)
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