A new plug-in conversion kit announced today, another coming soon.

Hymotion released a press release today announcing their new plug-in kit for hybrid cars.

At this time, Hymotion is offering the plug-in conversion kit for the Toyota Prius, but will soon offer one for the Ford Escape hybrid as well.

According to the release, the Hymotion Plug-in battery will "double" the fuel economy of the Prius.

Anthony Wei, Vice-President Business Development explains: "The secret ingredient to the 100 plus miles per gallon performance is the Lithium Ion Polymer technology in our PHEV battery. It's smaller, lighter, and more powerful than the NiMH batteries currently use in all Hybrid vehicle. This is the future."

For a single system the cost is $9,500. For those interested in starting a Prius conversion operation or for fleets, the Hymotion system is $6500.00 for orders of 1000 or more.

E-Drive, another plug-in provider offers systems that cost between $10,000 and $12,000, in comparison.

Additionally, I was contacted this weekend regarding the upcoming launch of another plug-in kit of sorts. Soon, a solar roof will be available for the Toyota Prius. This roof has been molded to perfectly fit the roof of the Prius and uses the sun to charge the hybrid batteries.

A formal announcement is due in a few weeks, so stay tuned.

More on plug-in hybrid cars.