Ordinary dry batteries are mostly manganese-zinc batteries, with a positive carbon rod in the middle, a mixture of graphite and manganese dioxide, and a layer of fiber mesh. The network is coated with a thick electrolyte paste, which is composed of ammonia chloride solution and starch. There is also a small amount of preservative. The outermost layer is a cylinder made of metal zinc, which is the negative electrode. The discharge of the battery is the electrolytic reaction of ammonium chloride and zinc, and the released charge is transferred from graphite to the positive carbon rod.