"The ultimate size of the miniature robots is primarily limited by the size of the power source — the three watch batteries. The body must be large enough to hold batteries to support power requirements of the robot.
“Batteries — both the physical size and battery life — have been one of our biggest issues,” Heller says. “The batteries need to run longer and be smaller.”"

gut zu wissen dass die mit den gleiche problemen kämpfen wie wir...