The Escape Hybrid uses hybrid technology similar to that used in the Toyota Prius. Ford engineers realized their technology may conflict with patents held by Toyota, which led to a 2004 patent-sharing accord between the companies, licensing Ford's use of some of Toyota's hybrid technology in exchange for Toyota's use of some of Ford's diesel and direct-injection engine technology. Ford maintains that Ford received no technical assistance from Toyota in developing the hybrid powertrain, but that some hybrid engine technologies developed by Ford independently were found to be similar to technologies previously patented by Toyota, so licenses were obtained. Aisin Seiki Co. Ltd., a Japanese automotive components supplier belonging to the Toyota Group, supplies the HD-10 hybrid continuously variable transmission for the Escape Hybrid. While Toyota produces its third-generation Prius transmission in-house, Aisin is the only supplier of hybrid transmissions to other manufacturers. Friction has arisen concerning Aisin's allocation of limited production capacity and engineering resources to Ford. Sanyo Electric Co. built the , 330 volt 5.5 Ah (would make it 1.8kWh storage), 250-cell nickel metal hydride (NiMH) battery pack for the 2005 Escape Hybrid.