You Do Need power plug adapter while traveling from Belarus to Guadeloupe.

Here is Why You Need An Adapter

The outlet and plug type used in Guadeloupe are C and E and in Belarus are C and F. This is how they look like.

Belarus

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

Type C

Type F

Guadeloupe

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

Type C

Type E