You should never let anything come between your car and a good battery connection.

Jan. 2, 2011 - PRLog -- If you want the day to come to a grinding halt in a hurry, driving with corroded battery posts is the way to do it. It takes only a millimeter of crunchy white residue to keep your car from starting.
Your car's battery is the starting point (no pun intended) for every system it uses. This is because it's used to start the car! The conditions surrounding your battery posts create the perfect breeding ground for nasty corrosion, which will appear as white, crusty residue around the battery posts. As the corrosion builds up, it becomes harder for your car to connect strongly with the battery. That's why we need to get rid of it.

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There are scores of products out there to clean your battery and help keep it that way. Here you'll find a couple of them, but the idea is pretty much the same regardless of your method - get 'em clean.
The first step toward a clean battery is the removal of your battery terminals. You can't wash your feet with your shoes on, and you can't properly clean a battery post with the cables connected.
You'll need one or two wrenches depending on your setup. Look at the terminal, it should have a nut on one side with the other side being either another nut, or a big square.

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If it's a big square, you'll only need one wrench. If it's another nut, grab two. You can use open end wrenches or something more universal like pliers or a small Crescent wrench. It's always best to use a properly sized tool if it's available, but since we're not race car mechanics,sometimes we just have to make it happen.
You should always remove the negative cable first. Place one wrench on the outside nut and (if needed) the other wrench on the other side. Turn the outside nut counterclockwise until you're looking at 1/16-inch or so of unscrewed space on the bolt. If you're lucky, a slight twist will pull it right off. If not, read on for removal tips.

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