How do you read the expiration date on D cell batteries?

To read the expiration date on D cell batteries, locate the printed code on the battery casing, which usually consists of a letter followed by numbers. The letter indicates the month (A for January, B for February, etc.), and the numbers represent the year of expiration. For example, a code of "C23" means the battery expires in March 2023. Always check for the most recent date to ensure optimal performance.