Car Battery

My previous post got me thinking about car battery's and how we boost them.  Why not have a smaller second battery inside your car that can be used to boost your car in an emergency?

Lets pretend that I had job that was actually important and beneficial to society, say a doctor and I left my lights on all night.  I get up to go to work and my battery's dead.  Okay maybe that's a bad example because a doctor would drive a new car which would turn off the lights automatically.  How about this doctor's driving a courtesy car because their car's in the shop.  Plus it's the middle of winter and they didn't want to take out their summer car, I mean my summer car.  The sick people of the world are depending on me to help them get healthy again.

Instead of waiting at least an hour for the tow truck to come and give me a boost I just flip a switch inside the car that draws power from the backup battery and away I go.  It's also a win for the tow truck companies because they will just make up the lost revue from car boosts by charging more for a tow and do less work at the same time.  Then once they've established their new towing rates people like myself will soon start to leave the switch on and drain the second battery, gaining back all their previous clients.  I see a future post wondering why not a switch that automatically flips back to the main battery once the car's been started.