eli5: Why do seemingly all battery powered electronics need at least 2 batteries?
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This is really only a thing with devices that take low voltage consumer batters (AA, AAA and the like) for reasons already described. There’s tons of devices with a single battery, sometimes an embedded one and sometimes removable. My camera, for instance, takes a proprietary battery and has its own charger. My phone and laptop have an integrated battery. I have a lot of devices that take a single small button cell batteries that are used in watches. I have tools from an electric screwdriver to a leaf blower that all take single proprietary batteries.
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