How to Charge a 4th Generation iPod Nano
- 1). Turn on the fourth generation iPod by pressing the button in the center of the click-wheel.
- 2). Connect a compatible Apple iPod USB power adapter to a grounded wall outlet and the dock connector on the bottom surface of the iPod Nano. The iPod Nano USB power adapter is sold separately, but allows users to charge the iPod while away from the computer.
- 3). Connect the iPod Nano to your computer using the provided USB 2.0 cable. Your computer must be powered on and not in sleep mode in order for the Nano to charge.
Source...