iPod nano 7th gen not charging

I recently got an iPod nano 7th gen 16GB slate. Whenever I plug it into my MBP using the new connector, I get the PLUG in the battery icon instead of the usual lightning. When I finally unplug the iPod after keeping it plugged in for quite a long time, it seems like I didn't charge my iPod at all (all I get in the battery icon is a red line).

Is there something wrong with the battery or the cable??