Hymotion of Concord, Ont., which was purchased earlier this year by battery developer A123Systems, has certainly hitched itself to the right wagon. A123 is working closely with GM on its new Chevy Volt concept plug-in car, and Hymotion now has a role in helping educate major automakers about the challenges of vehicle systems integration. But Hymotion also has its eye on battery replacement for the hybrid aftermarket. The first Toyota Prius was sold in North America back in 2000, meaning in a couple of years those first cars will need to have their battery packs replaced. Should the owners go with nickel-metal hydride, which is already in there, or higher-density lithium ion packs? And should they consider converting their vehicles to plug-in hybrid models? Hymotion is hoping that its lithium ion packs, based on A123 technology, and its plug-in retrofit expertise will be in demand as more nickel-metal hydride systems come due for replacement. For a profile of Hymotion, click here.