Can a portable jump starter damage my car?

Not if it has spark-proof clamps and reverse polarity protection. All three picks here have both safety features. Just follow the red-to-positive, black-to-ground sequence.

How many jumps per charge?

Most portable jump starters deliver 20-40 jumps per full charge on passenger vehicles. Larger engines use more power — expect 10-15 jumps on trucks.

Best Car Jump Starters 2026