When you take your old car battery in for a core charge the old car battery is then sent off to a recycling plant for batteries.
The old car batteries then go through a machine that pounds them apart and breaks them up and separates the lead and plastic.
Then the plastic and lead in the old car batteries is recycled and made into new batteries for cars, trucks etc.
So when you take your old car battery in it will be recycled into new ones.
Also you can sell your car batteries to some scrap yards and get between $2.00 to $6.00 per car battery depending on the size of the car battery you have.
The larger the car battery the more money.
But if you need to replace your car battery you should take the old battery in for a core charge.