Some other car manufacturers could do this intantly. Nissan has the best selling electric car (Leaf) on the market and Toyota has some kick ass hybrid engines (

Some other car manufacturers could do this intantly. Nissan has the best selling electric car (Leaf) on the market and Toyota has some kick ass hybrid engines (that's an electric engine AND a combustion engine) available for most of their cars. If they decided that battery only cars is the way to go they could switch from one day to the other. But they don't.