Also: As long as your battery is not dead dead (which, barring the freakest of freak occurences, comes with a lot of warning), just having a jump starter in your emergency kit covers it. Pop the trunk (which can be REALLY annoying on modern cars with only partially dead batteries…), grab it, and jump your car. Bonus points is you don’t need to frantically leap into the driver’s seat before you crash into a parked car.