Charging your ARDrone is really easy, but it does take around an hour and a half to charge from a completely dead battery, so leave yourself some time before a planned lesson to check your robot and recharge it if necessary. In order to charge ARDrone, simply open up your Accessory Kit inside the RobotsLAB BOX and pull out the ARDrone charger.
Remove the battery from the ARDrone (it's underneath the styrofoam shield -- just slide the shield off the robot, undo the velcro, and unclip the battery from the drone) or from the Accessory Kit, and clip the battery into the charger. The gold prongs on the charger should mate with the gold contacts on the battery pack.
From here, simply plug the charger into your outlet. While the ARDrone is charging, the charger will display a red light; once it is completely charged, the light will glow a solid green. Charging usually takes between 30 minutes and 2 hours, depending on how depleted the battery is.
We recommend checking your ARDrone with enough time before your lesson to charge it up if the battery is low. We also suggest you charge the ARDrone for a little while after your lesson, so it goes back into the BOX ready for the next teacher!