Capacitor have high current discharge but do not have high capacity charge. It won't hold enough energy to run your car radio for an hour for the same amount of size as with liquid cell. That is why you need to recharge it often.i do not understand the need for batteries, there are capacitors that can store all this power needed ..... it will hold more than enough charge after a week of sitting, to start a car a few times easily. and it weighs less than a baseball which is a heck of alot less than the 40# battery
Panasonic is one of the company that have good technology of battery. Think LITHIUM VANADIUM.Why pick an Asian run company when Johnson Controls has the capabilities and can keep jobs in the U.S. and pay taxes as a U.S. Company.