Went to Costco(Johnson) and Can.Tire(Exide).
Little stickers white background are attached to every battery,
e.g.F2 on top half of circular sticker.12-00 on bottom half.If one say 11-0,is it older than 6-01.Is this the date that the battery must be charged again by the shop?
FWIW,costco have batteries6-0 (stale?)while Can tire have fresher batteries if the above assumption are correct.
Tom 1992 300E 2.6