Logan Air are also planning on "the the world's first electric–powered commercial passenger flights" in 2021[0] using a converted Britten-Norman Islander. It is similarly for an island hopping service, with the shortest flight just 1.7 miles (typically around 1 minute) which it sounds like this converted DHC-2 de Havilland Beaver should be able to manage.

[0] https://www.pressandjournal.co.uk/fp/news/islands/1893676/el...