What are the safety precaution when dealing with Vinted lead acid batteries?

Handle it with care.

These are the precaution when dealing with vented lead acid battries :

• Always store or recharge batteries in a well-ventilated area away from sparks or open flames
• Damaged lead acid batteries shall be kept in properly labeled acid-resistant secondary containment structures.
• Use only chargers that are designed for the battery being charged.
• Always keep lead acid battery vent caps securely in place.
• Do not store acid in hot locations or in direct sunlight.
• Pour concentrated acid SLOWLY into water; do not add water into acid.
• Use nonmetallic containers and funnels.
• If acid gets into your eyes, flush immediately with water for15 minutes, and then promptly seek medical attention.
• If acid gets on your skin, rinse the affected area immediately with large amounts of water. Seek medical attention if the chemical burns appears to be a second degree or greater.
• Never over charge a lead acid battery and only replenish fluid with distilled water.
• Emergency wash stations should be located near lead-acid battery storage and charging areas.
• Prevent open flames, sparks or electric arcs in charging areas.
• Lead-acid storage and charging areas should be posted with "Flammable - No Smoking" signs.
• Neutralize spilled or splashed sulfuric acid solution with a baking soda solution, and rinse the spill area with clean water.

Avoid metal accessories (bracelets) because it may short the batteries that may produce electric shock.