HYDEE is a portable hydrogen fuel-cell power unit designed for mobility. It replaces traditional batteries with hydrogen fuel cells, providing long-lasting and stable power. Current lithium battery solutions frustrate users with three-hour charging delays and restrictive 40km ranges—inadequate for businesses users requiring 200+ kilometers daily. These constraints create costly vehicle fleet and operational inefficiencies that undermine sustainability goals. Compact and backpack-sized, it is ideal for outdoor, industrial, and emergency applications where grid access is limited.