Always wear eye protection when working on automotive batteries. Do not smoke, make sparks, or light matches or lighters near an open battery. The hydrogen gas in the battery is flammable.
You may do this procedure right in your car if you wish. It is very simple. Always do it in this order for safety reasons.
* Wash off the battery including the terminals with warm soapy water or baking soda and water to neutralize any acids on the battery surface. Do not get any solution in the batte... More