A zinc–carbon battery (or `heavy duty`) is a battery packaged in a zinc can that serves as both a container and negative terminal. It was developed from the wet Leclanché cell (eɪ). The positive terminal is a carbon rod surrounded by a mixture of manganese dioxide and carbon powder. The electrolyte used is a paste of zinc chloride and ammoni..... Found on http://en.wikipedia.org/wiki/Zinc–carbon_battery