There are other strings and an admission by Amy that these aren't being matched, and in fact, shipments include two different model numbers, a range of Ah, and date codes. I have found that some vendors consider the ship date the manufactured date, and vendors who think testing is matching. In my case, I was actually sent the spreadsheet that was obtained from EVE, but that was from Basen.
Amy sells both types, matched and unmatched (bulk cells). There is a significant price difference. For 280AH, bulk = $91.50, matched = $128.00 (plus shipping, as the most common example purchased).
Shenzhen Luyuan Technology Co., Ltd
If the above is the Amy you speak of. You certainly get more storage for your money with bulk cells. When you buy her matched cells, you get the spreadsheet as well (actually a link to obtain it from Eve). If you need high C rates, the matched cells are the only way to go. If you need a lot of low C rate storage, bulk cells are much more cost-effective. The thing I like about Amy, is you get exactly what she advertises. Her matched grade A cells are exactly that, and the bulk cells are brand new, not used and bloated cells. You will also notice the matched grade A cells say "Processing Time
15 days", that is because the factory matches them, then sends them to Amy, who then packs them and sends them to you.
I just like honest vendors who tell you what you are buying, and deliver what they promise. Yes, you pay more, but it isn't a gamble.
Bulk cells can be out of stock, but she always has the grade A cells in stock, because Eve manufactures them and matches them to send. They will match in groups of up to 16 (i.e. 48v systems).
So far the biggest complaint I've heard about Amy is slow shipping. But that goes for any vendor. I've never heard of anyone getting bloated or used cells, which is very important (to me, maybe not to you).