Before you begin, switch the ignition off and remove the key.

Make sure the transmission is in Park (or first gear if you have a manual gearbox) and that the parking brake is engaged.

Put on work gloves and safety goggles if you have them available.

In addition to being dirty, the battery contains corrosive agents and may release flammable gases.

Gloves can also help protect you from an unpleasant shock if you accidentally mishandle the battery.