280 and larger 320ah cells all seem sto have the same physical dimensions, why?

[rplarry]

I need to replace 2 low cells in my 48v 310ah diy bank, and in looking for replacements I notice that most all 280ah cells and larger are all the same physical dimensions. 72mm x 173mm x 208 mm. So my question is are they all basically 280 ah cells and some test better than others so they sell them at a premium? Also some cells are listed as 302 or 304ah. Just curious how they come up with these numbers other than doing a capacity test. The 16 cells I bought originally were advertised as 310ah but with in a few months I didn't seem to be getting that much from them so I paid more attention to my JBD bms and found 2 cells that were noticeably lower than the others causing the bms to shut off at 280ah of usage.

 

[Bvillebob]

The CALB 302 ah cells and the Eve 304 ah cells are real. The "310-320 ah" cells are not, they're just advertising hype. They're lower rated cells being sold at false specifications.

 

[meetyg]

There is a slight difference between 280 and 304 ah cells. From what I recall on a YT video (I think it was on Off-Grid-Garage), the 304 are slightly taller (like 1 cm).

 

[rplarry]

Thanks guys, that pretty much confirms my suspicions. Another newb falls for the hype. Live and learn.