Plug-In Supply Inc. Introduces Lead-Acid PHEV Prius Conversion System for $4,995

Plug-in Supply Inc. has unveiled a plug-in conversion kit for the Toyota Prius that can increase gas mileage to up to 100 mpg. The lead-acid battery system allows the car to go 10-15 miles on battery alone. The conversion can be performed in one day. A drawback: battery life is around two years. Plug-In Supply is working on providing a similar kit with lithium ion phosphate batteries that...