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Old 31-10-2022, 04:48   #1
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Well reco LFP vendor, reasonably priced

https://ebay.com/usr/grandvilleproducts

has been recommended to me by several people I trust, and I find eBay to be a great platform in that context, combined with a good buyer protection credit card and PP as another layer.

That said, anyone recognise those blue cells?

and ideally, know of a reco Ali seller for them when a large order might save a lot of money?

Grade A is critical, same production date, close to sequential S/Ns , well matched sets even better

To keep a narrow focus please limit this thread to discussion of sellers of **these cells only** or maybe others this vendor supplies, I like the CALBs as well.

No discussion of the drop-ins please, take that elsewhere.

Thanks in advance
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Old 31-10-2022, 06:58   #2
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Re: Well reco LFP vendor, reasonably priced

Ganfeng battery
Ÿ西赣”‹”‚”‘Š€‚份œ‰™…司 --Ÿ西赣”‹”‚”|赣”‹”‚”‘Š€
and

https://www.linkedin.com/company/jia...ttery-co.-ltd.


Note the first link opens even though the characters look exotic.
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Old 31-10-2022, 11:06   #3
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Re: Well reco LFP vendor, reasonably priced

http://www.ganfenglithium.com/productd_en.html
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Old 31-10-2022, 18:30   #4
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Re: Well reco LFP vendor, reasonably priced

The grey plastic cased CALB cells are designed for high current draw, not long cycle life. The Blue ones are better for cycle life, but CALB aren't well known for the product consistency. Sequential serial numbers will not help in regards to getting a battery pack that the cells are closely matched. There is a company that actually tests cells and produced closely matched cell groups, but you pay for such precision and the space industry is the main clients.
Far easier to link cells in parallel, the good parts of one cell will balance out the weaker parts of another cell in the same parallel cell group. There are two levels the cells must match if you are looking for a closely matched set, internal resistance after 10 cycles and capacity after 10 cycles, no reseller is going to do that for free .... Matched voltage on delivery is meaningless, you will see this as soon as you start charging them in series wired set. The charging current and voltage will be the same across the series string, but you will quickly see the voltage varies and some cells reach 3.6v long before the others.
The practice of linking all the cells in parallel and charging from there does equal out all the cells .... in the initial installation, they will wander about from that point onwards.
If you want to build your own closely matched parallel set, match the cell that charges to 3.6v with the cell that takes the longest to reach 3.6v, and so on across all the cells available. Then build your battery with series connections of these sets and charge that to 3.8v and watch how close they stay together, you might need to do a bit more switching around, but in the end you will have a battery that will stay in balance for quite some time over a lot of cyxcles and part cycles.

Much easier to build the battery from 4 cells in parallel and link these groups in series, balance charge them to 3.6v, then raise it to 3.8v and you will see they will stay together .... just a matter of averaging out the differences to end up close to the same group numbers across the battery.

As far as incredibly reliable quality cells, hard to go past Winston, but make sure they come in a box with the quality assurance paperwork inside, these are factory A class cells.

T1 Terry
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