But the strain on a lithium-ion cell in a plug-in is much greater than on the batteries in today's hybrids.

FORBES: Jump Start

The state has about 350 hydrogen fuel cells running around today, along with 34, 000 plug-in hybrid or all electric vehicles and 380, 000 conventional hybrids like the Toyota Prius, the air resources board said.

FORBES: California Sets New Rules To Boost Zero-Emission Car Sales

That kind of performance is unheard of in today's plug-free chargers, which tend to be powered by conventional alkaline or lithium ion batteries and often can only last for one or two charges before needing replacement or recharging on their own.

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Auto designer Henrik Fisker, co-founder of start-up Fisker Automotive, resigned as executive chairman today over disagreements with management over the future of the luxury plug-in hybrid manufacturer.

FORBES: Fisker Automotive Founder Quits As Company Seeks Savior

Along with a new Sphero Augmented Reality SDK available today on Github, Orbotix has created a new Sphero Augmented Reality plug-in for Unity, a flexible development platform used to make intelligent, interactive 3D and 2D content.

ENGADGET: Orbotix launches new Sphero AR tools to get the ball rolling on development

Starting today, anyone interested can go online to build and price their ideal plug-in hybrid at this site.

ENGADGET: Ford C-Max Energi pricing: $29,995 after a federal tax credit, available this fall

Today, Enterprise offers roughly 300 electric cars (including the Nissan Leaf, Chevy Volt and Toyota Plug-in Prius) and about 3, 200 hybrids (which run on both gasoline and electric power) throughout the United States, including California, Hawaii, Seattle, New York and Washington DC.

BBC: Rental cars go electric