After weeks of programming and testing, we have had on-going problems with the robot being inconsistent. The team tried using line followers and they were inaccurate. They had to figure out ways to deal with the error in robot navigation. Sometimes, the robots would become unresponsive and we would have to completely flush the robot’s memory and reload programs. Finally we went back to AA batteries after using rechargeable packs and it seemed to make a big difference…..