Why do batteries lose charge when they’re not being used?
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It depends. Modern electronics they’re never truly “off”, so the battery will keep getting drained. But even a completely disconnected battery isn’t actually indefinitely stable. The very thing that makes a battery work, the fact that it’s internally “connected” means that there will be internal “leaks” (i.e. currents that aren’t meant to exist but are impossible to stop completely). It might take shorter or longer, but ultimately everything wants to go back to equilibrium, and a battery is very OUT of equilibrium, by design.
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