eMark said:
My fifty 30Q 141 cells purchased from IMR last November had the same coding info printed on the metal can in the same location under the wrap as your 30Q 141 cell.
Your probably thinking
"how stupid to remove the wrap from all fifty of his Samsung 30Q 141 cells" (and rightly so).
goatman said:
to decipher code go to samsung 30q data sheet, page 16
https://www.imrbatteries.com/content/samsung_30Q.pdf
i took a picture of text
"https://i.imgur.com/W3P2buh.jpg"
I used both the Vruzend V1.6 and V2.1 kits for assembling three different 30Q 141 packs. My Samsung 30Q 141 10S3P pack is with the V2.1 kit. Both Vruzend kits are purposely designed so that 18650 cells would fit very tight in the end caps. Such that they could be damaged when at some later date one decides to remove some or all the cells from the end caps for testing, replacing, etc. Sooo, I removed all 50 of the wraps and even then the cells were still very snug in the end caps (used extra barrel bolts). Now the cells will be easier to remove for any future testing and/or for another use. If i hadn't removed the wraps it's possible some of the cells would have been damaged when trying to remove them from the end caps. The reason I chose the Vruzend kits is for experimental DIY use for ease of future replacement, testing, etc.
As you found out (or already knew) there is a protective vinyl-like washer on the positive end to prevent a direct short as the entire can is negative including its top circumference. The Vruzend V1.6 & V2.1 end caps are designed so that its inner surface contacts just the center area of the positive cathode. Still included the vinyl washer in the positive end cap as extra protection.
No idea how to interrupt those codes. At one time I thought the
IEA2 code was a more specific production run code. I had asked IMR
not to send me all 50 cells from the same production run (if possible). I'm now thinking that both
L0J4 44812 and
IEA2 is primary production run code, but no idea of the significance of IEA2 and the other three similar location codes on my 50 cells. Possibly, indicating a different run date?