No new* iPod since the 2008 models has charged on your dock. With the exception of some of the iPhones, iPods from 2007 and earlier allowed charging by either the firewire or the USB charging pin. Starting last year, Apple disconnected the firewire charging pin in the iPod's dock connector (* with the lone exception of the 2008 classic, not sure if they finally disconnected it for the 2009 classic). Although Apple's suggested specifications had requested accessory makers not charge via the firewire pin and instead only use the USB charging pin for some years, they'd never enforced it before last year. Since it's more expensive to make an accessory that charges via the USB pin, many accessory makers ignored Apple's advised specifications and continued to make accessories that charged via the firewire pin. However, since it's cheaper to make an iPod that only charges via the USB pin, guess what Apple finally decided to enforce?