Why a battery cell is of 2 volts?

A battery cell is often designed to produce 2 volts based on the electrochemical properties of the materials used in its construction, particularly the positive and negative electrodes. Common examples include lead-acid batteries, where each cell generates approximately 2 volts due to the chemical reactions involving lead dioxide and sponge lead in sulfuric acid. This voltage level is a result of the standard electrochemical potential of the materials used, which allows for efficient energy storage and release in practical applications.