The article presents an attempt to design the 2W power source (PS) based on air–hydrogen fuel cells (FCs) and water–aluminium micro-generator as a hydrogen supply (WAHMG). Experiments concern FC’s breathing in compact arrangement and combined performance of FC+WAHMG. It turned out to be necessary to build a fan into FC stack provided the rotation speed of fan depends on the FC current. The highest power density of FC at optimal speed of air blowing was 101mWcm−2. Electrical energy produced by FC was about 1.2–1.8Wh per gram of Al in micro-generator. This value depends on the total yield of hydrogen in WAHMG and hydrogen losses due to purges.