Although he refuses to reveal figures, Mr Ghosn says the cost per kilowatt-hour (kWh) of battery capacity for Renault-Nissan cars has fallen by half in four years.

ECONOMIST: Electric cars

The 2100mAh battery powers the unit for about 16 hours of use (60 hours on standby) and can be charged to 70 percent capacity in about an hour.

ENGADGET: Topic: Mobile

It now has two USB ports instead of one, a microSDXC slot, micro USB charging, backlit LCD screen, higher capacity 3300mAh (8 hour rated) rechargeable battery and is 50% faster, all while maintaining the same size and form factor.

ENGADGET: Hyper debuts iUSBport mini, 2 and HD cloud storage and streaming devices (hands-on)