Power your USB-C MacBook anywhere and expand it to connect all your devices. Mobile Power: Voltus is a powerful battery which can charge your MacBook and two USB devices simultaneously. Voltus is your MacBook’s mobile power source. At home, Voltus connects your power cord to your MacBook. It’s always charged and ready to go when you are. When you’re away from your desk, Voltus powers your MacBook for up to 13 hours, allowing you to focus on your work instead of hunting for an outlet.