Despite power failures, electric car drivers are managing to find ways to charge their batteries.
Wireless chargers use a transmitter located in a parking space or garage floor that connects to a receiver mounted under the car.
The Nissan Leaf, Chevrolet Volt and various Toyota Prius models all scored well.
Sales of the purely electric supercar were scheduled to begin at the end of the year, but executives appeared to back off that prospect this week.
Carmakers wonder if the lithium-ion cells will become cheap enough, at a fast enough pace, to make pure electric and plug-in hybrid cars economically practical.
The plug-in hybrids may stall when in motion, but General Motors said the problem did not pose a safety hazard.
A123 Systems had a new 'game-changing' EV battery and then suddenly filed for bankruptcy. What happened?
A self-taught scientist, he invented the nickel-metal hybrid battery and contributed to the development of many other devices.
Reluctant to fill their gas tanks, Chevy Volt hybrid owners tend to recharge their cars more frequently than drivers of the all-electric Nissan Leaf do.
At a luxury-goods exposition in Manhattan on Wednesday, Fisker executives discussed the bankruptcy of the battery maker and supplier to the Karma plug-in hybrid sedan.