Use an old cell phone charger and a usb socket extention cable to make a wall charger ( this does not come boxed with the zen micro and costs Â£30 ). This is very easy to do.
Step 1: Get a Cell Phone Charger, One That Will Charge at 5 Volts ( the Usb Voltage ) It Should Say This on the Charger. I Use One From a Sagem MyV-55. Cut Off Phone Input Socket and Expose the Wires.