Remove the battery.

A typical car battery can weigh 50 pounds or more, so lift carefully and get help if needed. Do not drop the battery, as this can release dangerous chemicals.

If your battery cable clamps look dirty and/or corroded, clean them up with a wire brush and a mixture of water and baking soda before installing your new battery.

To prevent corrosion in the future, coat the new battery's terminals with a little dielectric grease or petroleum jelly.

Don't throw the old battery in the trash. Many auto parts stores and service stations will accept old batteries for free safe disposal.