It's very effective for expressing a state of 'burnout,' where all physical and mental energy is depleted. It can clearly show a breaking point, as in "I can't take any more."

This emoji also symbolizes the anxiety of modern society, where smartphones are essential. This is because 'battery level' is often seen as the 'energy available for today's activities.' Everyone will relate if you send it to a friend during exam season or after working overtime.