You Do Need power plug adapter while traveling from Saint Barthélemy to Australia.

Here is Why You Need An Adapter

The outlet and plug type used in Australia is I and in Saint Barthélemy are C and E. This is how they look like.

In Saint Barthélemy, outlets of type C and E are in use.

Type C

Type E

In Australia, outlets of type I are in use.

Type I

I am from

going to