A handheld fan is usually supposed to be small and light. KOBAYASHI KAITO ELECTRO took the opposite route with a 'world's most powerful(?) handheld fan' driven by a Makita power-tool battery for Maker Faire Tokyo 2026. The device is assembled from five 3D-printed parts and accepts the chunky tool battery directly. It remains technically handheld, but its power system has clearly wandered into the world of workshop equipment.