The 4 digit code on the bottom of most lithium batteries

[die5el]

Was doing a bit of research on batteries and found this which references the 4 digit code on the bottom of most lithium batteries

"Cylindrical type batteries: (Four Digit Date Code Used)
1. The first digit shows the last digit of the year (7 = 1997).
2. The second digit shows the month code.
The following codes are used to indicate the month:
1 = Jan., 2 = Feb., 3 = March, 4 = April, 5 = May, 6 = June, 7 = July, 8 = Aug, 9 = Sept.
0 = Oct., Y = Nov., Z = Dec.
3. The third digit shows the week of the month.
1 = First week, 2 = Second week, 3 = Third week, 4 = Fourth week
4. The fourth digit shows the day of the week.
1 = Mon., 2 = Tues., 3 = Wed., 4 = Thur., 5 = Fri., 6 = Sat., 7 = Sun.
Example: A date code of “7612” indicates that the battery was assembled on Tuesday the first week of June 1997
(June 3, 1997). "

Might be useful to someone

 

[sneaker]

I don't know if this will change my life, but interesting all the same, I'm off to check the lappy batteries.