It goes beyond just the charge status of an electronic device to figuratively express "ready to go" or a "state full of vitality." You can also use it when you're ready to start a new project.

It symbolizes positive energy and potential, often appearing in conversations about self-improvement or exercise with the meaning of "charging up" or "powering up." When used with the opposite emoji, 🪫, it can dramatically show a change in energy levels.