No, but a jump start can harm you if done improperly. It’s frustrating to turn the key to start your car and find that nothing happens. Many drivers carry jumper cables to make a temporary connection with another vehicle’s battery in order to start their car. Once enough power is provided to crank the engine, the normal charging system recharges and the cables are removed. Driving the car then restores the original charge.
However, batteries contain sulfuric acid. The acid turns into a vapor that is highly flammable. Jumper cables can generate a spark, which can ignite the vapor and cause an explosion. Read your owner’s manual carefully before attempting to jump start either your vehicle or someone else's.