Mild hybrid

Vehicle with an electric machine-assisted engine, incapable of running fully electric

Mild hybrids (MHEV) are generally cars with an internal combustion engine (ICE) equipped with a minimally extended battery and an auxiliary electric combined motor and generator in a parallel hybrid configuration that is only enough for an electric-only mode of propulsion at slow speed and allow the engine to be stopped whenever the car is coasting, braking, or stopped, and then restarted once power is required again. Mild hybrids may employ regenerative braking and some level of power assist to the internal combustion engine.

This keyword could refer to multiple things. Here are some suggestions: