2015 Toyota Prius needs to innovate to stay on top

http://cleantechnica.com/2012/07/07/2015-toyota-prius-needs-to-innovate-to-stay-on-top/

/ hybrid electric nickel metal hydride battery regen regenerative braking energy recovery kinetic system Atkinson cycle low rolling resistance tyres tires hybrid regen regenerative braking kinetic energy recovery system electric car vehicle automobile internal combustion engine ICE nickel metal hydride battery reliability defects reliability complex /