What if...
-there was mini solar panels you could connect to your battery to charge it anywhere. *
-there was an energy converter that you could connect to the car battery, that you could breathe into and it would convert the heat of your breathe into energy to charge the battery.
-there was an energy converter that you could connect to the car battery, that you could plug your phone into that would take the power from your phone's battery to charge your car's battery.
-there was something you could put underneath your clothes that would collect your body heat and convert it into electricity that you could then connect to your car battery and it would charge it.
-there was something you could put into your shoes that would collect energy as you ran/walked, that you could then attach to your car battery to charge it.