As a battery gets older or as it gets lower charge the amount of power it can provide at once is also lowered.
More complex devices, such as laptops or smartphones can adjust their processors and other components to try II and handle this, but it can mean somewhat reduced performance for high demand tasks. If you’re just reading an email or posting on Reddit you might not notice, but try doing a more demanding task like render a 4K video and you’ll see a slowdown.
For simpler devices like flashlights or toothbrushes you’ll notice more directly.
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