BYD Seal UA Seal U has arrived in New Zealand for evaluation, appearing in December registration statistics. Upon closer inspection of the data, the model that has landed is registered as a petrol plug-in vehicle. BYD Seal U interiorThe Seal U is predominantly driven by its electric motors, with the petrol unit only being used to generate or provide drive at higher speeds. It was not developed from the ground up as an electric vehicle; BYD developed it at the request of the European market. The Sea Lion closely approximates the Tesla Model Y in size, being 20mm longer but 10mm narrower.