A ton of LiFePo⁴ cells

Alkaline · Dec 21, 2023

Brucey said:
So the round terminal V3 tests around 300 and the octagonal V3 tests at 312. What does the V2 test at?

Is the octagonal actually basically a V4? Makes me want to just get the 304s to avoid all this nonsense with the 280K series.

280K is indeed a drama queen.

based on my research:

V1 280K around mid 280's real world test
V2 280K around upper 270's real world test
V3-R 280K with round base base mid 290's real world test
V3-O 280K with octagon base upper 300's real world test

I say this because when you test base on AH alone you will usually come 4-5 Ah lower than the spreadsheet, simply based on current. So a 313 will test to about 309.

EVE/SFK say you have to divide wh/3.2 to get match the label rating but that is another can of worms so we'll just stick to shunt amp measurements as its the most common method.

Notice: we are all bitching about a 280 cell not giving 300+. Truly spoiled we are

Brucey · Dec 21, 2023

True, my understanding is that the actual capacity drops down after about 15-20 cycles anyway to a longer term trend

wfdTamar · Dec 21, 2023

My guess is that based on the round terminal base and the Ah result, the dual bolt ones in the SFK video are actually v.2 ones.

I was almost going to post that the OP's cells may not be v.3 until post #10 in the close up through the bolt holes it looks like the straight angled bit of the octagon (not round), so v.3.

As for the bitching about not getting 300+ - I see the stated capacity as a minimum (at least for 'Grade-A'). You would hope/expect a bit more. So for the 304Ah I've just received I'd hope for more. Maybe 310Ah+ (just testing the first now. Boy it takes ages with the little 20/5Amp tester).

Alkaline · Dec 21, 2023

I think maybe the Dual Pole EVE cells are like Version 2.5 (basically a fixed version 2)
And the new ones with octagon base are Version 3

May be the EVE adapter doesn't fit the octagon so they are making both version 2.5 and version 3.

Again this is EVE and they never really tell the whole truth.

But either cells should more than easily hit its rated 280.

Lets assume they loose 20 AH on the top end, so a round base 300 will settle to like a 275-280 ish after the honey moon cycles

and the Octagon will be about 290 ish.

It comes down to if you want the eve terminal or if you want a little more capacity.

Spunky · Dec 21, 2023

A pic is worth a thousand words, a vid is worth a thousand pix.

18650 has hexagonal V3s
Both are nice flat cells.

Alkaline · Dec 21, 2023

Thanks for the pic/vid now we have no idea on what is really going on maybe someone from EVE will chime in.

wfdTamar · Dec 21, 2023

Just means the dual bolts doesn't determine the cells under it. I have them on Eve 304's.

lfpinside · Dec 21, 2023

Alkaline said:
Column H?

View attachment 184447

Alkaline said:
Column H?

Column J

Alkaline · Dec 22, 2023

lfpinside said:
View attachment 184447

View attachment 184514

Column J

You said OCV3 was missing I said look at column H.

lfpinside · Dec 24, 2023

Alkaline said:
You said OCV3 was missing I said look at column H.

OCV3 Time missing, not OCV3

Spunky · Jan 1, 2024

Still nothing but crickets from 18650. Talked to a lady there that looking up my email and said, "she'd forward it to management".
I put the 4 new cells on a EBC-40, zketech and got these results. I'll test one of the SFK cells soon and compare to the EVE test sheet that SunFunKits promptly provided up front along promptly answering emails, phone calls and text.

308.9Ah 04QCB76G51603JD9F0004605

307.8Ah 04QCB76G40703JD9F0008513

307.3Ah 04QCB76G51703JD9G0003838

304.9Ah 04QCB76G40703JD9F0004292

Alkaline · Jan 1, 2024

Spunky Those look great for 280AH rated cells they are all higher than 280. The SFK cells have the round bottom so I'm guessing you will be mid 290s with the SFK 280Ks as they are round terminals vs the octagons that the 18650 have.

The Octagon 280K are basically 1 KW cells and the round look to be around 940 WH.

Spunky · Jan 4, 2024

Here's the test subject:

1st discharge; 292.5Ah

Recharge;. 293.8Ah started @ 20A, but got impatient.

2nd discharge; 291.0Ah
.19mΩ @ 2.89V (after discharging)

Running 40 amps through 10ga leads was giving off heat, so I'm not sure if that energy was being counted in the test. I'll run one more test at 20amps.

Either way, those hex top cells test higher than other ones.

Alkaline · Jan 4, 2024

Yeah the octagon are about 10 ah more from what I have read. In fact some grade B 280K octagons are doing 290 as well. So 290 ish for the round base v3 and 300 ish for the octagon. Also if tested in temps below 70 it would be a little less but may at most 2-3ah.

Rossman · Jan 4, 2024

Alkaline said:
Spunky Those look great for 280AH rated cells they are all higher than 280. The SFK cells have the round bottom so I'm guessing you will be mid 290s with the SFK 280Ks as they are round terminals vs the octagons that the 18650 have.

The Octagon 280K are basically 1 KW cells and the round look to be around 940 WH.

Re-watch the video. It looks to me like the cell on the right is round terminal and the one of the left is octagonal?

SalmanFarooz · Mar 1, 2024

Mr. Spunky do you have a manual or guide on how to setup the cells? I just got 48 cells and 3 bms units but no instructions on how to set them, there are a LOT of wires and connections.

Spunky · Mar 2, 2024

SalmanFarooz said:
do you have a manual or guide on how to setup the cells?

This is the BasenGreen pdf from their site.

https://www.basenpower.com/uploadfile/2023/10/25/20231025104904bypnPT.pdf

42OhmsPA · Mar 7, 2024

This is a strange one... Makes me question Gobel...
@Spunky your thread is famous...

Link from email reroutes to this thread.

A ton of LiFePo⁴ cells

Finally received my cells today, looks like my winter indoor project will be a long one. Stacked four high, 40 cells per box. In possession, going low and slow. Unboxing video And a closeup. They'll be going into Basen-Green rack battery boxes and SunFunKits also found me some new Pace...

gobelpower.us20.list-manage.com

Spunky · Mar 7, 2024

Are they drawing conclusion from @Alkaline comments?
That because, the cells are all basically charged before reaching 3.65v, they must be grade A?

For sure I'd say they were well matched. Maybe Gobel sees premium cells as all being near some high tolerance point?

Either way, it's not me. This Forum is leading the way and the manufactures are all ears.

I'm still building batteries in between work and outdoor projects that the warm weather has made possible.

I had a HelTec balancer fail (kinda like Will's up-in-smoke deal), but there to catch it. I was only using it to commission the batteries and have alligator clips on the leads.
Now wiring Neey Smart Active Balancers with BT into each battery. I sure like having an App to monitor things.

42OhmsPA · Mar 7, 2024

Not sure what they are doing, I found it odd they are linking to your thread.
I've never even dealt with that person from Gobel, it appears to be a mass email.

A ton of LiFePo⁴ cells

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