Will the emf of battery vary with size?

The electromotive force (emf) of a battery is primarily determined by its chemical composition and the electrochemical reactions occurring within it, rather than its size. While larger batteries may have greater capacity and deliver more current, the emf itself remains largely constant for a given type of battery. Therefore, two batteries of different sizes but of the same type will typically have the same emf. However, size can influence other factors like internal resistance and overall performance.