About the colors, is the difference as extreme as it seems in the pic? I looks like some are an aqua color and some the normal blue.
With mine the one cell that is sealed funny is a slightly different color and texture, and the ridges are at slightly different heights. The battery number is a low 8 digit, so I don't think it's a repair job, but one they found hiding in a corner somewhere forgotten. It's probably several years old, but if quality really is slipping, it may outlast all the others (IR is 2nd from bottom and capacity 2nd from top).
Yes, blue tops to aqua bottoms.
hard to see in this pic, center cell is darker.
"Hiding in a corner" LOL, that is exactly my thought too.
One additional small complaint. Do NOT take their cell measurments as gospel. 5 cells are 1/4" larger than they were supposed to be, causing me to re-do some battery box lining, thankfully not the frame.
As far as cell ampacity goes, I cant complain. All were WAY above their rating. The lowest was maybe 137AH. (130 nominal) But I am limited as to the weakest cell, but still over advertised rating.
CALB is the only manufacturer with a cell in the 130AH range, to my knowledge. It fit my car and budget nicely.