Imagine what smartphones would look like if they still had to be powered by AAA batteries.
That's a false comparison. We have Lithium and NiMH batteries available off the shelf for common things that aren't phones. The technology is available for a COTS phone battery replacement, as long as it matched a common form-factor.
And if phones can't work around a common battery form-factor but yet all look like fucking candy-bars, then I call bullshit.
When talking about randos we don't know, it may be helpful to include a title; like "two-time shark wrestler Joe Budden" or "space golfer Britney Whatever" so we can hopefully pick them out of the 8 billion people on this planet.