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Most battery-powered electronic calculators now use button cell batteries. These are cylindrical and look like small, thick coins. Button cells generate electricity through a chemical reaction and then transfer the electricity out of metal cases in which they are held. Most button cell batteries for calculators use either lithium or zinc as one of the chemicals and either manganese dioxide or silver dioxide as the Other. The two chemicals react with one another to generate a small electrical current. The battery's metal case then conducts the current and uses it to power the Calculator. The table below highlights the three main types of button cell batteries that are found in calculators, including information about their electrodes and voltage.