![]() If the port is designed to support the USB Battery Charging specification, then the amount of power is upped to 7.5 watts (1.5 amps at 5 volts). SuperSpeed USB offers up to 900 milliamps, which translates to 4.5 watts, according to Ravencraft. The current Hi-Speed USB (2.0) specification offers external devices up to 500 milliamps for charging. "Power is king today, and the way you manage it is pinnacle." "We also deliver more power for faster charging," said Jeff Ravencraft, president of the USB Implementers Forum (USB-IF), a nonprofit organization founded by the developers of the USB specification, which includes Intel, Microsoft and Hewlett-Packard. It uses only 1.5 amps of power for charging devices, or about one-third of the power of its predecessor Hi-Speed USB (v2.0). SuperSpeed USB is optimized for power efficiency. So it's hard to imagine any external device interconnect technology that could challenge USB. The USB installed base is more than 10 billion units, and those devices are growing at more than 3 billion a year. Among PC and peripheral device manufacturers, USB adoption is virtually 100%. ![]() ![]() USB is among the most successful interfaces in the history of personal computers.
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