Batteries for electronic products store DC power as AC cannot be stored.
The best way to think about AC and DC currents are in terms of distance. If you want to transport power over long distances, such as from a power station along the grid into homes, the higher-voltage AC will be used. Whereas for short distances, such as from an electronic device’s internal battery to powering the device, DC is preferable as it can be stored and used when required.
Larger electronics such as a laptop computer will be run on both battery and mains power, and in these cases the device will come with an AC-adapter of some sort which will take the AC current and convert it into DC which the devices run on.
Watch this video for a scientific explanation of the difference between AC and DC currents:
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