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Use proper handling and safety procedures when working with car batteries.
Author: Brittany Lin NOCO® Team Leader
Lead-acid car batteries contain hydrogen and oxygen gases that can be explosive. The acid inside the battery is very corrosive and can cause severe burns to your skin if it leaks from the battery. To avoid danger and possible injury, see these safety precautions below for handling and working with a lead-acid battery. Handle with care as acid may leak if the battery is cracked or damaged.
Wearing proper eye protection will help prevent acid from getting into your eyes. Always wear rubber or mechanic gloves when pouring acid into the battery as it can burn your hands. In addition to proper eye protection, be sure to remove all jewelry to avoid electric shock or burns if you touch the battery terminals.

When working with car batteries, be sure not to smoke or cause sparks anywhere near your work area. Doing so can cause a fire or even an explosion of the battery.
When working with car batteries, make sure you are in a well-ventilated area as batteries give off harmful chemical fumes. To avoid any harmful inhalation, be sure to open a window or garage door to let the fumes escape.

Whenever you are working on your battery, whether it is starting, testing or charging, do not stand over it or touch the battery. Although it is not common, sparks or explosions can occur. It is safe practice to maintain a safe distance while performing any of these tasks.
Some batteries have removable caps for checking and/or refilling fluids, however, some batteries are permanently sealed. Never attempt to open a sealed battery as it could be under pressure and may explode if punctured.

When starting a car with a jump starter, always remember that when initially installing the clamps, you should install the positive clamp first, then the negative clamp. However, when it comes time to remove them, always remove the negative clamp first, then the positive clamp.