Originally Posted by hey_joe
USB 3.0 makes a difference only to data transfer and not charging the battery when compared to USB 2.
You are right. USB 3.0, the latest version of USB (Universal Serial Bus), provides better speed and more efficient power management than USB 2.0. USB 3.0 is backward compatible with USB 2.0 devices; however, data transfer speeds are limited to USB 2.0 levels when these devices inter-operate.