Manganese is a chemical element with the symbol Mn and atomic number 25. It is a hard brittle slivery metal, often found in minerals in combination with iron. Manganese is a transition metal with a multifaceted array of industrial alloy uses, particularly in stainless steels. High grade, high purity manganese is used as a primary cathode material in lithium-ion manganese batteries or NCM batteries.

MHEV (Mild Hybrid Electric Vehicles) are automobiles with an internal combustion engine (ICE) equipped with an electric machine (one motor/generator in a parallel hybrid configuration) allowing the engine to be turned off whenever the car is coasting, braking, or stopped, yet restart quickly. Mild hybrids may employ regenerative braking and some level of power assist to the internal combustion engine (ICE), but mild hybrids do not have an electric-only mode of propulsion

Mining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lode, vein, seam, reef, or placer deposit. These deposits form a mineralized commodity that is of economic interest to the miner. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay. Mining is required to obtain any material that cannot be grown through agricultural processes, or feasibly created artificially in a laboratory or factory.

Mixed hydroxide precipitate (MHP) is a nickel and cobalt-cointaining intermediate product that can be used as a raw material imput for lithium-ion battery production. 

Miles per kWh (mpkWh) is the unit used in the car. Some EVs use Wh per mile (or kilometer), which is similar in concept to the litres/100km used in many places for ICE vehicle fuel efficiency.