Q) What can happen if a lead-acid storage battery is charged or discharged too quickly?
A) The battery could overheat and give off flammable gas or explode
It is important to treat 12-volt lead-acid batteries with respect. They can be dangerous in spite of the apparent low voltage. A typical car battery is capable of producing considerable current during discharge. If charged or discharged too quickly batteries can overheat, give off hyrdogen gas, or even explode.