You Do Need power plug adapter while traveling from Sint Maarten to Cape Verde.

Here is Why You Need An Adapter

The outlet and plug type used in Cape Verde are C and F and in Sint Maarten are A and B. This is how they look like.

Sint Maarten

In Sint Maarten, outlets of type A and B are in use.

Type A

Type B

Cape Verde

In Cape Verde, outlets of type C and F are in use.

Type C

Type F