• I think you need to think about the component that is causing the effect rather than the entire circuit. A battery is a fixed-voltage DC power supply. As the battery starts to run out of electrolyte, the battery's internal resistance increases, so the voltage output drops, but, if the internal resistance increases faster than the output voltage decreases, the output current has to increase to compensate (Ohm's Law: V = IR). This is further driven by the circuits call for constant power (P = IV) at a reduced voltage. Thus, the battery will supply more current if it is able to do so, leading to possible over-current of other circuit components.

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