It's unlikely that switchable/swappable batteries will be a thing in aviation. Even in the smallest aircraft, the batteries weigh hundreds - or thousands - of

It's unlikely that switchable/swappable batteries will be a thing in aviation. Even in the smallest aircraft, the batteries weigh hundreds - or thousands - of kilograms, comprise the bulk of the aircraft's dry weight, and are likely to be tightly integrated with the rest of the airframe for structural and safety reasons. Most aircraft spend enough time on the ground between flights to make fast DC charging quite practical, and certainly much more so than swapping out huge batteries.