OP what did Luyuan tell you, because if you bought grade B then that is fine as you paid for grade B.
On side note if you paid 530 for grade B then I'm sorry but that is over priced, I would be paying no more than $50.00/cell for grade B 280K or $55 for grade B 304.
I specifically stated that i wanted Grade B cells, Amy is straight forward and honest
I paid 92$ per cell (280k V 3)
that was the best price i got then, now it will cost 150$ maybe because shipping is obstructed due to the conflict in the red sea.
Grade A EVE LiFePO4 304Ah Cells are ideal for off-grid solar batteries and leisure batteries. Full supporting documents are available upon request (UN38.3, Specification Reports & MSDS). UK Stockist. Low Prices.