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As the battery is discharged the electrolyte concentration is reduced, becoming pure water when the battery is fully discharged. Because of this change in electrolyte concentration the battery resistance increases during discharge. Loss of electrolyte is also a frequent cause of increased electrolyte resistance.
Also, what causes internal resistance in a battery?
Sulfation and grid corrosion are the main contributors to the rise of the internal resistance with lead acid. Temperature also affects the resistance; heat lowers it and cold raises it. Heating the battery will momentarily lower the internal resistance to provide extra runtime.
In respect to this, what happens when internal resistance increases?
As the resistance of the variable resistor was increased, the current through the circuit decreased. (As using E=I(R+r), for emf E to remain constant, if R increases, current I must decrease). Therefore voltage across the terminals increased (as less is wasted across the internal resistor).
The chemical reaction that takes place inside a battery is the main thing of increasing internal resistance of the battery by increasing of time. Due to that the internal voltage drop also increases which leads to decrease of the terminal voltage of the battery…