Bosch Battery Manufacturing Date Code. A Delco code starting with 2C indicates the battery was shipped in. A number and a letter are all you need to know the date of manufacture of a car battery.
The other two second and third. The second two numbers specify the month from 01 to 12. For example March is 03 and November is 11.
Not sure if this is right.
To determine the decade add 2 to the first number if the sum is 10 or 11 disregard the first 1. Some but not all batteries show the expiration date. I understand that H3 might indicate the eighth month of 2013 - ie. With batteries what matters is the number laser etched or physically melted as a string of numbersletters into the case.
