Hello there, @Kawaman. I'd be happy to guide to claim expenses on an electric car in QuickBooks Self-Employed (QBSE).
Thanks for providing details of your concern. To help you claim expenses on the electric cars, you can use the Travel Auto category under Box 20 of the Self Assessment tax return (SA103F). For reference, please read this article: Allowable and disallowable expenses explained. From there, see the description of Box 20 in the SA103F section.
To ensure you'll record it correctly, I recommend reaching out to your accountant for guidance. They can provide a brief information on how you can handle this and assist you through out the process. If you're not affiliated with one, you can use our Find an Accountant tool to look for one near your area.
For additional information, check out the HMRC website.
Keep me posted if you have any other concerns managing your electric car expenses in QuickBooks. Have a good one and stay safe.