Why do batteries lose charge when they’re not being used?
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Batteries work by having a lot more electrons in one side than the other. They tend to have an insulator in the middle that prevents those electrons from going back.
However a small amount of electrons slowly go back to get equilibrium, slowly discharging the battery.
The insulator in some batteries is thicker to prevent this discharge, but just makes it slower, it never truly stops. Having an insulator that is too thick removes useful space for actual capacity and adds weight. So batteries that want the most capacity will also discharge fast. Batteries that discharge very slow will have less capacity.
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