Charge your Robots & Check for Updates: Each robot has a rechargeable battery; plug into the wall or computer it takes 60 to 90 minutes to charge. We recommend a five or ten port charger for multiple robots. The robot is charging when the micro USB connection port illuminates with the cord plugged in and when the light turns off the robot is fully charged. Dash has a battery life of 90 minutes and Dot has a battery life of several hours. The power button will flash when they have less than 10 % battery left.