what is power bank?????????
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A battery charger, or recharger, is a device used to put energy into a secondary cell or rechargeable battery by forcing an electric current through it. The charging protocol depends on the size and type of the battery being charged
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Power banks work by using sophisticated electronics to manage taking in charge from a charger, storing it in a battery and then charging other devices. Power banks are not just a simple battery: they use sophisticated electronics circuitry to manage being charged, and then charging other devices.
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