I picked up my car with the new bullet connectors on it, connected the batteries and man did that thing spark! Is there any way to prevent the spark?

Also, when storing the batteries while travelling or at the house, what do you do to prevent the wires on the batteries from touching together? Any cool ideas for separating them like a some type of insulative covers to put over the ends or holders to keep the wires apart? Since I am fairly new to the R/C world, I am just wondering if there are commonly known ways to prevent sparking and shorting.