As a former appointed commissioner of a local emergency services district in my state, I know that an emerging problem with EVs of all sorts is how first responders react to an incident involving an EV. MINI may be including distinctive yellow vehicle markings to alert first responders from a distance that they are about to deal with an electric car, which carries with it many hazards for both first responders and vehicle occupants in a crash or other incident. See, for example, this FEMA article --
"Know the threats before you attack an electric vehicle fire".
"There are over 1 million electric and plug-in cars on U.S. roads. The batteries used in these cars have special safety concerns for first responders if there is a car fire.
These cars can experience multiple classes of fires:
Class A (tires, fabrics, plastics).
Class B (fuel) [hybrids].
Class C (lithium-ion batteries in hybrid and electric cars).
Class D (magnesium, titanium, aluminum and lithium).
Electric vehicle fires can exceed 5,000 F. Applying water or foam may cause a violent flare-up as the water molecules separate into explosive hydrogen and oxygen gases.
There are several common risks for first responders associated with electric vehicle fires:
Electrical shock (up to 400 volts) [and in the newest EVs coming to market, up to 800 volts].
Extremely high temperatures and thermal runaway.
Toxic fumes.
Lithium burns (respiratory and skin reactions).
Toxic runoff.
Reignition up to 24 hours after initial extinguishment."
So, before deciding to completely obscure these yellow badges on one or more sides of your MINI SE, you will also want to give some consideration to this subject.