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

Here is Why You Need An Adapter

The outlet and plug type used in Hong Kong is G and in Saint Barthélemy are C and E. This is how they look like.

Saint Barthélemy

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

Type C

Type E

Hong Kong

In Hong Kong, outlets of type G are in use.

Type G