Here are some sources where you can find free technical information on electric vehicles:

1. The U.S. Department of Energy offers a range of resources on its website, including technical specifications, research reports, and case studies. You can access the information here: https://www.energy.gov/eere/electricvehicles/electric-vehicle-basics

2. The Electric Drive Transportation Association (EDTA) is a trade association that represents the electric drive industry. Their website has a range of resources on electric vehicles, including technical papers, reports, and infographics. You can access the information here: https://www.electricdrive.org/index.php?ht=d/sp/i/20952/pid/20952

3. The National Renewable Energy Laboratory (NREL) is a research laboratory that focuses on renewable energy and energy efficiency technologies. Their website has a range of technical resources on electric vehicles, including reports, studies, and technical papers. You can access the information here: https://www.nrel.gov/transportation/electric-vehicles.html

4. The International Energy Agency (IEA) is an intergovernmental organization that works to ensure reliable, affordable and clean energy for its member countries. The IEA's website has a range of resources on electric vehicles, including reports, studies and technical papers. You can access the information here: https://www.iea.org/topics/electric-vehicles

5. The Society of Automotive Engineers (SAE) is a professional organization for engineers in the automotive industry. Their website offers technical resources on electric vehicles, including standards and technical papers. You can access the information here: https://www.sae.org/standards/content/ev/

These are just a few examples of the resources available. There are many other organizations and websites that offer technical information on electric vehicles that you can search for as well.