As for Docan, they are just making up stories, they bought these at auction from CATL, who like EVE, REPT, GANFENG sell off the cells that fail testing in auction, they are bought up by 1-2 grade B whole sallers, who apply the fake QR code and sell to people like Docan, Basen, QSO e.t.c.
Interesting they shipped in 4 pack boxes.. these came from Docan as well?16 more of these cells. I've just unpacked them and tested the IR. All cells are within 0.22-0.24mOhm and are within 1mV difference. The IR was expected to be a bit higher than the stated one because cells are at ~8 degree Celsius.
I'll have some capacity numbers in a month or two. These will first go in the compression enclosure and then be tested.
There are 32 more that are still unpacked but they are for a friend of mine. If I get any data for them I'll post it here.
Lmk how you build your enclosure for your 16s pack.. ill be building the first 4s pack next week.. SFK kit enclosure with JK BMSInteresting they shipped in 4 pack boxes.. these came from Docan as well?
Lmk how you build your enclosure for your 16s pack
I get it, on the surface these seem amazing, cheaper than EV grade A EVE 280K and getting higher capacity, but on the same time they could be degraded 302, and no one can say otherwise because the original qr code was scratched off.
The weight checks with the spec for 280ah cell. 302 are heavier according to what I found online.Couldn't you just check the actual weight? I would think there would be a slight difference..
Without a doubt, buying batteries can be a crap shoot, but isn't everything that way now? There are ways to keep the odds in your favor. Usually, it costs a few dollars more.
The 6 I tested so far were 297 to 299 . I broke the connector for the display on my test bms. Had to solder the wires on . Not easyJust finished the capacity testing. All cells are 295 to 299ah. Given my crude methods I'd say they are all close enough. I'm going to top balance and assemble my pack.
So far I'm pleased with what I've got.
Just bumping the undercharged cells to match the rest.View attachment 123494
5.34kg - 280ah, 5.51kg - 302ah.
It also states +/- ~300g so I guess you could say they could be within a error margin. ?
I still think I got what I paid for.
Ahh haha the plot thickens.. I notice yours says 302ah @ 966wh. Many of my cells test above 966wh.. in fact 966wh was the lowest iv seen.. they usually test 971wh to 973wh but iv seen as high as 989wh.. but none tested above 299ah. The important thing to remember is that these cells are rates for .5P not C on discharge. P is based on degraded power output over life per the spec sheet so don't use them in 4s 12v packs if you plan on pushing them hard. If you do, plan on using 2x packs in parallel to share the load of say a 3000w inverter. In larger packs 8s and up should be ok. Generally speaking..Haha, I have just received another Docan CATL 280 batch from Chinese warehouse. And noticed one cell with original QR code instead of small ones.
And it is ..... it is .... CATL 302
Not sure if this is a good, or not so good thing. Is 280ah an actual battery size, or are all 280ah just poor performing 302?Haha, I have just received another Docan CATL 280 batch from Chinese warehouse. And noticed one cell with original QR code instead of small ones.
And it is ..... it is .... CATL 302
probably the latter, which still gets you more ah than you paid for, but i would not be happy regardlessNot sure if this is a good, or not so good thing. Is 280ah an actual battery size, or are all 280ah just poor performing 302?