It doesnât matter if your car is brand new or 25 years old â if something goes wrong, your battery can die and leave you stranded. It seems like no one carries jumper cables anymore, and waiting for AAA or a tow truck just adds to the frustration. Hereâs another option at a discount right now on biggy smiles, and youâll be able to jump your car yourself. Reverse -charge ProtectionNo reverse charging back to the unit after the vehicle started Short-Circuit ProtectionPrevent short-circuit occurring while two clamps are connected. Over-temperature ProtectionAutomatically stops working when the temperature is getting too high Reverse Polarity ProtectionNo damage happened while the clamps are connected in wrong terminals Over-discharge ProtectionEffectively prevent over-discharge of the battery in the jump starter. Over-charge Protection Effectively prevents over-charge of the battery in the jump starter.