Only because they are then fungible. Once you dispose of that calculator that takes 4xAA batteries and lasts 6 months, you can whack the cells in a Furby's butt

Only because they are then fungible. Once you dispose of that calculator that takes 4xAA batteries and lasts 6 months, you can whack the cells in a Furby's butt and charge them up once a week until your children get rid of the damn things :-)