How do you charge a Nano Copter Blaster 3D?

You must turn the copter OFF. Turn the remote off, and turn it over so the back of the remote is facing you. Slide the small door next to the battery compartment down to gain access to the charging cable. Plug the cable into the copter (careful, it only goes one way). Leave the copter off and turn the controller On. The LED on the controller will be green while charging, and will turn Red when the copter is fully charged.