Question

why a battery get discharged

Answer 1

hii i hope it will help u

Self-discharge is a phenomenon in batteries in which internal chemical reactions reduce the stored charge of the battery without any connection between the electrodes. Self-discharge decreases the shelf life of batteries and causes them to initially have less than a full charge when actually put to use.

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Answer 2

Basically, when a battery is being discharged, the sulfuric acid in the electrolyte is being depleted so that the electrolyte more closely resembles water. ... Here's what happens when you turn on a load (headlight, starter, etc). The sulfate ions move to the negative plates