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Xuba Electronics: DEAL - 280AH LiFePo4 cells. Purchase & Review

andruby said:
My cells arrived yesterday. Very well packaged. Outer box with an inner box, with proper foam. The terminals weren't taped off though.

The 105Ah cells unfortunately have M4 screws on the terminals, not M6. The holes in the bus bars are large, so I'm a little worried if the contact area is large enough to push 100A. Would these bus bars be good enough? I'll need to use "fender" washers when using the screws since the screw heads are tiny and the bus bar holes are large.
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I've been following along for a while looking at building a 48V 280AH pack. The knowledge among the people on this forum is amazing. I am on a learning curve and need help. I hope I can jump in the middle of the thread to ask a related question. My requirement is for 60-80AH continuous, 150A for 10-15 minutes and peak 300A for <30 sec. I am building the pack for a golf cart. The EVE 3.2V 280AH document I have says it requires M4 screws and the thread depth is 6MM. Are the specs (M4 and 6MM) sufficient for this rate of discharge? The 6MM thread depth concerns me the most.
 
Tony said:
I've been following along for a while looking at building a 48V 280AH pack. The knowledge among the people on this forum is amazing. I am on a learning curve and need help. I hope I can jump in the middle of the thread to ask a related question. My requirement is for 60-80AH continuous, 150A for 10-15 minutes and peak 300A for <30 sec. I am building the pack for a golf cart. The EVE 3.2V 280AH document I have says it requires M4 screws and the thread depth is 6MM. Are the specs (M4 and 6MM) sufficient for this rate of discharge? The 6MM thread depth concerns me the most.
Click to expand...
Once again, all the screws do is hold the parts together. The amount of electricity that flows thru them is minuscule. Most of it flows thru the flat surface of the bus bars against the cell terminal and the ring terminals on the wires/cables. The old style battery terminals in your car, the bolts just clamp the cable part around the battery part. It is the surface to surface contact that is important.

Once you wrap your mind around that, it will become clearer.....

You don't want a big heavy cable just hanging off those small screws. Attach the cable to something to support it's weight.
 
You preferably need to use a stud instead of a screw. Also the screw is not the main contact to get the current through, the terminal surface is - so you need to have a nice bus bar that makes good contact with the terminal. I use copper washers (which I make myself) as well. Using a stud will help prevent over-tightening. Use the correct size stud to prevent screwing too deep and breaking the battery.
 
upnorthandpersonal said:
You preferably need to use a stud instead of a screw. Also the screw is not the main contact to get the current through, the terminal surface is - so you need to have a nice bus bar that makes good contact with the terminal. I use copper washers (which I make myself) as well. Using a stud will help prevent over-tightening. Use the correct size stud to prevent screwing too deep and breaking the battery.
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Studs like these let you hold the stud still while tightening the nuts. Screw them down finger tight against the bottom and back them off a turn or so.



https://www.ebay.com/itm/M6-Stainle...var=422976773637&_trksid=p2057872.m2749.l2649
 
upnorthandpersonal said:
You preferably need to use a stud instead of a screw. Also the screw is not the main contact to get the current through, the terminal surface is - so you need to have a nice bus bar that makes good contact with the terminal. I use copper washers (which I make myself) as well. Using a stud will help prevent over-tightening. Use the correct size stud to prevent screwing too deep and breaking the battery.
Click to expand...
Thank you both for your quick response. The question is - is 6MM thread depth sufficient to hold the buss bar tight to the terminal of the cell? I've read about losses and heat as a result of resistance from a faulty connection. Is there enough force with that connection? Yes, I would use a stud for this. Thanks and I appreciate your patience if I am asking the question wrong.
 
Tony said:
Thank you both for your quick response. The question is - is 6MM thread depth sufficient to hold the buss bar tight to the terminal of the cell? I've read about losses and heat as a result of resistance from a faulty connection. Is there enough force with that connection? Yes, I would use a stud for this. Thanks and I appreciate your patience if I am asking the question wrong.
Click to expand...
From what I have read here, the holes are 10mm deep and M6 threaded. I will know more when mine arrive tomorrow.
 
Sgt Raven said:
From what I have read here, the holes are 10mm deep and M6 threaded. I will know more when mine arrive tomorrow.
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Here's the relevant section from the EV document I have:
Remark: The pole is a double aluminum pole structure. The internal screw with size M4 is used in the poles. The anti-torsion of pole is 8Nm. The torsion should be less than 8Nm when used. The effective thread hole depth is 6mm.
 
Yes, and in an ideal world you would use a torque wrench to do that correctly, and some other tools... Or just use studs and don't overdo. Focus on the proper bus bars and maximizing contact, and don't over-tighten.
 
Tony said:
Here's the relevant section from the EV document I have:
Remark: The pole is a double aluminum pole structure. The internal screw with size M4 is used in the poles. The anti-torsion of pole is 8Nm. The torsion should be less than 8Nm when used. The effective thread hole depth is 6mm.
Click to expand...

Your document isn't for the 280 Ah cell or is outdated. Current 280 Ah EVE cells are M6 threaded.
 
BiduleOhm said:
Your document isn't for the 280 Ah cell or is outdated. Current 280 Ah EVE cells are M6 threaded.
Click to expand...
Oh, thank you. My document version is A for the LF280 (3.2V 280Ah) Product. Not sure how I got such an old document.
 
Tony said:
Here's the relevant section from the EV document I have:
Remark: The pole is a double aluminum pole structure. The internal screw with size M4 is used in the poles. The anti-torsion of pole is 8Nm. The torsion should be less than 8Nm when used. The effective thread hole depth is 6mm.
Click to expand...
That must be a typo or mistake, because we have people here who have received their XUBA 280AH cells and they say differently...
I'll take the word of one of us who has the cells sitting in front of them, over the spec sheet.....
Then I will know for sure in 24 hours or so.......
 
Sgt Raven said:
That must be a typo or mistake, because we have people here who have received their XUBA 280AH cells and they say differently...
I'll take the word of one of us who has the cells sitting in front of them, over the spec sheet.....
Then I will know for sure in 24 hours or so.......
Click to expand...

Problem already solved, he had a very old datasheet.
 
Steve_S said:
I'm not at all tickled with the Couriers playing the Gouging Game during a crisis... blue air audit
I hope these are as good as what XUBA has been shipping. Let us know how it goes. I'd suggest another thread though, something easy to ID like "280AH cells from Dongguan Lightning Energy delivered to Canada" or something like that and put your experiences in there, any photo's info etc provided and that will let others know... just like this thread and my MNDares thread did for XUBA. Actually, I think someone MAY Have started a Dongguan Lightning Energy thread already...
Click to expand...
Thanks...I'll check.
 
ghostwriter66 said:
YEAH - here's what you should have done ... you should have told them NO THANKS and that you will have to go with another vender offering a lower amount ... God Bless my ppl but YES -- they all think that you are rich and all have tons of money and when YOU gave them $1258 you literally screwed the next guy because if YOU are willing to pay it -- then THAT becomes the NEW price ....

SO JUST SAY NO ... and wait them out .. trust me -- she would have cam eback with a Special One Day Deal becuase you are our #1 customer for $1190

Shipping rates have NOT gone up a penny
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That's an interesting take on it. Curiously, the salesperson from Xuba (Amy) told me the same thing...that shipping cost increased by pretty much the same amountl. I didn't go with Xuba because I didn't want to wait until sometime in April for these to come back in stock there. Maybe a scam...but maybe not...(or maybe they are working together?? ) I wonder if other people experienced the same thing this week.
 
ghostwriter66 said:
YEAH - here's what you should have done ... you should have told them NO THANKS and that you will have to go with another vender offering a lower amount ... God Bless my ppl but YES -- they all think that you are rich and all have tons of money and when YOU gave them $1258 you literally screwed the next guy because if YOU are willing to pay it -- then THAT becomes the NEW price ....

SO JUST SAY NO ... and wait them out .. trust me -- she would have cam eback with a Special One Day Deal becuase you are our #1 customer for $1190

Shipping rates have NOT gone up a penny
Click to expand...
Here is Amy from Xuba's communication that day.

Wan Amy2020-03-16 18:14


And recently the freight has risen greatly...

According to the original channel, the freight has risen to $651
 
Well. I just inquired with Haomi about those 16x 280ah to Ireland and the rep immediately said she recommends rail transport (22-28 days) as air cargo to Europe is expensive right now because of covit19. Knowing that a airlines are grounded I tend to believe her.
 
lonnf said:
That's an interesting take on it. Curiously, the salesperson from Xuba (Amy) told me the same thing...that shipping cost increased by pretty much the same amountl. I didn't go with Xuba because I didn't want to wait until sometime in April for these to come back in stock there. Maybe a scam...but maybe not...(or maybe they are working together?? ) I wonder if other people experienced the same thing this week.
Click to expand...

XUBA does not stockpile much inventory -- they utilize - JUST IN TIME -- so thats why their prices fluctuate with each purchase sometimes -- OTHERS will buy up an entire RUN CYCLE of 10,000 batteries and hold them ... that way they get the best price (bulk) and they can maximize progits (if the market price rises)
 
Has anyone else who purchased the 280Ah cells from Amy/Xuba received M5 screws and terminal holes?
Or am I just metrically challenged?
My measurement of the screws provided which fit the terminal holes show a nominal diameter of 5mm which is correct for M5, AFAIKnow. Spec sheet revE from EVE says M6 but spec for diameter of those is 6mm
Can anybody clear this up?
 
Christo said:
Has anyone else who purchased the 280Ah cells from Amy/Xuba received M5 screws and terminal holes?
Or am I just metrically challenged?
My measurement of the screws provided which fit the terminal holes show a nominal diameter of 5mm which is correct for M5, AFAIKnow. Spec sheet revE from EVE says M6 but spec for diameter of those is 6mm
Can anybody clear this up?
Click to expand...

How did you measure the diameter? 6 mm is the external diameter including the threads.
 
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