Some year!
 

A year ago I needed a battery. Chose Sam's over Costco.
At my Costco, they directed me to a shelf of batteries and said, "There they are. Take it home and bring back the old one." Let's see, possibly injure my back lifting and changing, burn clothes with battery acid, freeze my fingers changing the battery, and drive twenty miles for the core charge refund. To each, his own.

I brought the old battery in when I picked up the new one, so there was no core charge. I’d rather change the battery myself and know it was done right. It takes time to clean off the terminal connectors and properly treat both the battery terminals and connectors with a good terminal protector. I wouldn’t trust some kid working at Sam’s or Autozone to do the job to the standards I expect.