Eli5: How does a power bank charge a device until it dies, wouldn’t equilibrium be reached?
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It’s like pouring into a glass from a kettle. If you just connected them it would just reach an equilibrium but instead you raise the kettle as you pour and thus are able to pour everything save the last few drops.
The power bank contains a circuit that always keeps it’s voltage higher than the device you are charging, resulting in a similar effect.
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