First of all, maintaining your vehicle's battery is crucial for starts. Next, the battery produces flammable gas and corrosive acid, so avoid sparks, wear safety glasses, and work in a ventilated area. If present, remove and clean the battery with a water and baking soda solution. Reinstall without overtightening. Also, use a slow-rate charger to avoid damage. Remove corrosion with a baking soda solution and cover damaged parts with a zinc-based primer.