将已用过的小型废干电池的顶端剖掉,取出其中碳粉的混合物加热烘干,把锌筒洗擦千净,把导线一端焊接在其底部,再将碳粉混合物放入其中代替碳粒,并将较粗碳棒放入筒内,使其底端与碳粒接触,另端焊接导线,然后如 The top of the used small waste batteries cut off, remove the mixture of carbon powder heating and drying, clean the zinc cylinder, one end of the wire welded to the bottom, and then put the carbon mixture into the carbon instead , And the coarser carbon rod into the barrel, so that the bottom of the carbon particles in contact with the other end of the welding wire, and then as