After every use, recharge the robot fully. When its eyes change color, this indicates that the robot is done charging, so then you can remove it from the charge connection. Do not leave the robot on continuous charge. Don’t leave it charging more than one day for example. Leaving it on continuous charge can reduce the lifetime of the battery.
Insert the USB cable into the charging socket on the underside of the 'bot. Connect the other end to a spare USB port on a PC or laptop. Or you can connect to a USB charging plug.
If you have the Docking Station or Six-Bot USB charger, then place the 'bot into that and connect the power cable. Unplug the Docking Station when charging is complete.
Bee-Bot charging lights:
Blue-Bot charging lights: