Hello,
If a USB device is disabled with SEP's Device Control then the operating system will power down that device.
On Windows 2000, XP and 2003 Devices such as Androids, iPods, cameras and other types of portable devices will not be able to get charged. On newer operating systems such as Windows Vista, Windows 7 and 2008 the operating system will allow the devices to receive power even if they are disabled.
Reference: Block or allow devices in Endpoint Protection
http://www.symantec.com/docs/TECH175220