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

Here is Why You Need An Adapter

The outlet and plug type used in Thailand are A, B, C and O 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

Thailand

In Thailand, outlets of type A, B, C and O are in use.

Type A

Type B

Type C

Type O