[NYVette]

Charging lead-acid batteries produces hydrogen gas. Very explosive depending on the hydrogen to oxygen ratio. (think Hindenberg) Always keep a charging battery well ventilated to not allow a critical mixture. Never be smoking near a charging battery or remove a battery cable which could cause a spark.

Also true is the corrosiveness of the sulphuric acid on exposed metals. Mix a few tablespoons of baking soda with a cup of water and carefully brush it on the metals in question. Do not get any of the baking soda mixture in the fill holes on top of the battery. The alkalinity of the baking soda will neutralize the acid. As always when doing something like this wear eye protection.