Question

What is the origin of the internal resistance of a battery? Does this depend on the age or the size of the battery?

Answer 1

The internal resistance of a battery has two causes. The first is the electrical conductors used in the battery.Means parts and materials used in battery.

The second component is the chemical process that takes place in the battery. As the chemical process takes place that generators the power other undesirable chemical processes are also taking place. The undesired by-productions interfere with the desired chemical process and builds a layer of poorly conducting material on the electrical conductors.

Internal resistance also depends on size and age of battery.