How to read a Optima battery date code

Decode a battery date code now (runs in your browser).

The rule

On the white label, the first four digits of the serial are the last digit of the year followed by the day of the year (6086 is day 086 of a year ending in 6, March 27, 2026). Ignore the round inventory sticker: it is not a manufacture date.

Source: Optima blog post on where the date code is.

Worked examples

Verify the result with the maker or the shop. The year digit repeats every ten years.