I found these white traces quite strange too but scraping it seems that they are residues of the glue that was used to seal the battery box. There are 3 temperature sensors on the battery, and they have never exceeded 35°CThis is a CONCERN, such heat discoloration is NOT a good sign, looks scorched (burnt) from overheating.
Cells appear to be EVE 230AH.
Try to take a clear photo of the QR Codes and one of us can decode it. Alternatively, the Google Play Store has a "LiFePoQR Battery QR scanner". that will give you the details.
View attachment 113753
I have looked at the EVE cells on the internet, and it seems that they are just grade B cells?
I will clean the white marks and watch that they do not come back. Thanks