USB Type-C is the most flexible connection for notebooks and smartphones. The most important of its many capabilities is as a charging socket for battery-powered devices — this should finally make everything simple: One socket, one cable, one power supply for all devices – from computers to smartphones and tablets to headphones and other peripherals. So much for the theory, which always sounds simple with USB. The practice is more confusing. Not every USB-C power supply is suitable for every device, not all Type-C ports can be used to charge devices quickly or at all, and not every Type-C cabl…