Safety Precautions and Repair Tips: Always work in a well ventilated place. Avoid open fire, flames, sparks, etc. Batteries can release explosive gases. Never hook jumper cables to a frozen or damaged battery. Always detach the negative (-) cable first. Reattach the negative (-) last. Always wear goggles when servicing batteries. Always use the appropriate tools for removing terminals, cleaning, reaming and replacing them. Should battery acid come in contact with clothing, wash immediately. This product contains chemicals, including lead, known to the state of California to cause cancer and birth defects or other reproductive harm.