USB Charging Information
Most devices can't/won't charge from normal powered USB hubs if the computer is turned off/not connected. That includes most Android, Apple iOS, and Windows devices. The phone/tablet must negotiate how much power to pull, to do so by the original USB specification, devices are supposed to only draw 100mA at first and then they can then negotiate up to 500mA. This negotiation requires a PC that's attached and on. Unfortunately even at 500mA, charging most devices will take a very long time to charge.
Continue reading “Plugable USB Universal Fast Charge-Only Adapter for Android, Apple iOS, and Windows Mobile Devices”