True. Many 1980's electronic devices needed too much power to be run by the NiCd batteries of that era. I failed to learn DC motors, controllers, and gear box

True. Many 1980's electronic devices needed too much power to be run by the NiCd batteries of that era. I failed to learn DC motors, controllers, and gear boxes in part because I lacked batteries powerful enough to drive the small motors I had. (Or maybe I was an idiot:o) Decades later, lithium 18650 cells make it easy for my students.