This 3D animation explains in English the Galvanic cell (also known as Voltaic cell) by means of the Daniell cell, which is composed of a copper half-cell and a zinc half-cell. The video clearly explains how this type of battery works (copper zinc battery).
1) Basics of the Galvanic cell (cupric sulfate solution + zinc sulfate solution)
2) What is a saltbridge (KNO3) / diaphragm?
3) Oxidation and reduction (zinc and copper)
4) Charge balancing
5) Measuring the voltage
6) Redox reaction of the Galvanic cell