Hydrogen fuel cell forklifts combine the sustainability of an electric truck with the practicality and short refuelling time of an internal combustion engine. The fuel cell system on a forklift consists of the fuel cell stack, the 350-bar hydrogen tank, a small lithium-ion battery to temporarily store surplus energy, and a fan. All this is contained in a cast frame the size of a classic lead-acid battery and can be installed relatively easily in a conventional electric forklift. Inside the fuel cell stack, the hydrogen is mixed with air, where it reacts with the oxygen in the air to produce water. During this chemical reaction, electrical energy is released; this energy is collected and used to drive the electric motors that power the forklift’s propulsion, lift and tilt systems.