Oye Store Cells, Advice needed.

Solr

New Member
Joined
Jun 10, 2021
Messages
6
Hi,

I have bought 4 320ah cells from Oye store on Aliexpress, after nearly 4 months they have finally arrived.


Good points, they were really well packaged for transport, and as soon as I opened a dispute for lateness, the seller has been keen update me with progress, I understand that the shipping times are out of the sellers control.

One of the cells is 0.04v less that the rest and had a bit of slight bulging around the negative terminal; its my first experience with LIFEPO4 so just wondered if this is worth worrying about.

If not I will top balance them then do a capacity test.

Also are these EVE cells?

Cheers.

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DLTooley

Solar Enthusiast
Joined
Jan 12, 2020
Messages
131
I'm certainly not the most experienced person here, bit I'll give my first take.

You will want to do a top balance as well as capacity and internal resistance tests Most likely you will have a workable cell but it will require compression and will have a marginal negative effect on the entire pack. Longevity is unknown. Compression will prevent physical bus bar damage from the expansion.

You are going to have additional costs. Dealing with issues like this can make sense for larger purchasers but the costs are such that for a 4s purchaser you are better off just paying more from a known good supplier. Those currently apparently include Luyuang and Dongquan, I personally used Luyuang.

I'd inform the seller that you are initiating testing and preliminarily request a full refund of costs for the marginally bad cell pending a testing of all. The additional equipment costs should be roughly covered by the refunded cost of the bad cell.
 

Solr

New Member
Joined
Jun 10, 2021
Messages
6
Thanks for the advice, I have informed the seller about the initial damage and am waiting to hear back.
I have started the top balancing and will capacity test once that's done, I will update the thread with how it goes.
Unfortunately, I didn't find this forum till after I had bought them, so missed the advice on sellers.
Luckily I found the forum though, as there is a lot more to it than buy a bms, and buy some cells :)
 

Solr

New Member
Joined
Jun 10, 2021
Messages
6
I have another question, the swelling on mine is only at one side around the anode terminal, I have been looking at other swollen batteries and they appear to be swollen both sides in and the middle, which makes sense if its caused by gas in the casing; could it be that in my case its an issue with manufacturing?
 
Last edited:

elvis_asaftei

Solar Enthusiast
Joined
Jul 5, 2021
Messages
229
Hi,

I have bought 4 320ah cells from Oye store on Aliexpress, after nearly 4 months they have finally arrived.


Good points, they were really well packaged for transport, and as soon as I opened a dispute for lateness, the seller has been keen update me with progress, I understand that the shipping times are out of the sellers control.

One of the cells is 0.04v less that the rest and had a bit of slight bulging around the negative terminal; its my first experience with LIFEPO4 so just wondered if this is worth worrying about.

If not I will top balance them then do a capacity test.

Also are these EVE cells?

Cheers.

View attachment 66507
View attachment 66510



Same as my situation. Please note that OYE store is exactly the same company as PWOD and they send BULGED cells to everyone, just open their 1 start comments from ALiExpress.

More details here :


and here :


also here about a lot less capacity than advertised for OYE store :

 
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