You Do Need power plug adapter while traveling from Sri Lanka to Balearic Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Balearic Islands are C and F and in Sri Lanka is G. This is how they look like.

Sri Lanka

In Sri Lanka, outlets of type G are in use.

Type G

Balearic Islands

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

Type C

Type F