upvote
That's true even today for HAM radio handhelds. There is a cottage industry of ever larger snap on batteries for Baofengs and others. Very handy.

Random thought: Maybe Apple should use radioisotope batteries to never have to change them, ever. I jest.

reply
My early iPhones had external battery cases, which even when attached (when travelling a long distance) were smaller than modern iPhones in the important dimensions.
reply