280ah vs 302ah also CATL vs EVE

ShockinglyAverage

New Member
Joined
Nov 10, 2020
Messages
21
So I was contacting a few suppliers on Alibaba about LiFePo cells. I sent Basen a message and Sophia Zhu responded to my questions but at the end added "I would recommend sourcing EVE 280Ah for better consistency. Higher cost performance." What follows is the rest of our conversation:
Me: "Are the 302ah cells not grade A brand new cells that are matched? Are they used bulk cells or something?"
Her: "yes,Grade A,Brand New and QR Code"
Me: "So then why would the 280ah cells offer 'better consistency. Higher cost performance'?"
Her: "Because CATL is easy to bulge in high temperature during transportation.
But after discharging first and then charging, the battery will recover. You can also choose EVE 304Ah."

So I guess my question is, has anyone heard this? Is there any truth to it? I've never heard anything about CATL being more prone to swelling. I don't really understand why this would be the case but looking forward to any info you might have.
 

mrzed001

Voice of reason
Joined
Apr 10, 2020
Messages
740
Location
Hungary - EU
So I was contacting a few suppliers on Alibaba about LiFePo cells. I sent Basen a message and Sophia Zhu responded to my questions but at the end added "I would recommend sourcing EVE 280Ah for better consistency. Higher cost performance." What follows is the rest of our conversation:
Me: "Are the 302ah cells not grade A brand new cells that are matched? Are they used bulk cells or something?"
Her: "yes,Grade A,Brand New and QR Code"
Me: "So then why would the 280ah cells offer 'better consistency. Higher cost performance'?"
Her: "Because CATL is easy to bulge in high temperature during transportation.
But after discharging first and then charging, the battery will recover. You can also choose EVE 304Ah."

So I guess my question is, has anyone heard this? Is there any truth to it? I've never heard anything about CATL being more prone to swelling. I don't really understand why this would be the case but looking forward to any info you might have.

Actually I think the new CATL (?) cells @Will Prowse bought were a bit puffy too when arrived.
Here : https://diysolarforum.com/threads/a...heaper-than-lead-acid-video.27274/post-324611
 

Stepandwolf

Solar Addict
Joined
Nov 14, 2020
Messages
635
Did you see his last video? Apparently he got a bunch of junk as they were swelled and didn't meet their capacity claims.

Thought the claim on batteries sold as 310 to 320a were actually 302 was interesting.
 

ShockinglyAverage

New Member
Joined
Nov 10, 2020
Messages
21
Batteries swell?
I was looking for CATL 302AH. After reading your information, I became more and more worried. I asked my person in charge. My person in charge, James, is from Dongguan Lightning and told me that this battery does expand. For CATL 302AH this is normal

1. The energy density is high, the specification is 302ah, but the capacity of the product can reach 315-320ah.
2. The process technology of the battery, the cycle life of the battery is 4000 times, and the discharge of the battery is high.
3. The battery is an aluminum shell, which has good extensibility and internal chemical reaction to generate energy. Cause swelling.
4. However, CATL 302AH is a product with high cycle life, high discharge rate, high energy density and good process technology.



The rhetoric of your person in charge is not very professional.


My person in charge told me: For the battery bulge, it is usually caused by overcharging. If you like this battery (CATL 302AH) and worry about the battery swelling during transportation, we can compress the battery for you when it is shipped. Winding cells.

sounds great! ! !
View attachment 64396
Considering you joined Monday right after I got an unsolicited message from another brand new account selling the same Dongguan Lightning cells, I’m just going to assume you’re the same company spamming all posts trying to push product.
 

mrzed001

Voice of reason
Joined
Apr 10, 2020
Messages
740
Location
Hungary - EU
No, I am not a spam, I am from Austria.
I let me know about the battery swelling issue through the post you sent. I was very worried, so I asked the supplier.

Anyway, thank you for letting me know, this battery will swell and some things I don't know.
Hi neighbour :)

Personally (based on the lot of posts about the matter) I think the CATL cells are being more prone to swelling.
Maybe has thinner alu housing than EVE cells ?
Also it is very different if the cells are transported on a ship (in large metal container under the sun), or by train.
Dongguan transports them to EU in train. Less heat shock. So it can happen that the same cell shipped to us is perfect but shipped to US becomes a bit puffy.
 
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