Got All my flashlights out for Hurricane
Found batteries with expiration dates from 2010
Holy Charlie, Gene & Francis

Got 3 Maglites for truck carry

My 4 D cell works fine but the batteries exploded
took a day to fix had to drill it like a Dentist does a root canal and then fill it with Coke a Cola

Works great again

Don't know much about serial numbers but one is 2014 one has to be 20 years old