The mastermind behind this beastly build is a Reddit modder who took a GBA SP and mounted it on a DeWALT XR FLEXVOLT lithium-ion pack. This isn't just any battery—it's a heavy-duty, 18-volt lithium-ion pack designed for power tools like drills and saws. The original tiny GBA battery? Gone. In its place sits a buck converter that expertly steps down the 18 volts to the ~4 volts the Game Boy needs to function. The result? A rugged, industrial handheld that feels like it could survive a construction site—or a gaming apocalypse.