lithium ion car and motorcycle batteries

I use anti-gravity batteries light weight 16v lithium battery in my car. Amazing how a 4lb battery can start and run the car 10's better and longer than the 54lb turbostart 16v I had in it. I was so impressed, I will be running one of their 12v in my 64 barracuda. Easiest 50lbs off the nose of the car ever.