See a doctor as soon as possible. If acid contacts the skin, wash the affected area immediately with plenty of water. Avoid chemical burns by not rubbing eyes or skin while working with the battery. Wash hands immediately after completing the job. Clean up all acid spills and flush clothing with a water and baking soda solution.
Vent caps are tight and level.
Placing a damp cloth over vent caps when charging may act as a flame arrester. The vent caps on top of a battery are designed to help keep the acid electrolyte within the battery and to keep dirt out. The vent caps should always be kept firmly in place. When an electrolyte runs out of a battery it can cause corrosion of the terminals and cables, reducing battery function. Keep the top of a battery clean and free of corrosion by periodically washing the battery with a solution of one-quarter cup baking soda to a bucket of water.