You Do Need power plug adapter while traveling from Sierra Leone to Bahamas.

Here is Why You Need An Adapter

The outlet and plug type used in Bahamas are A and B and in Sierra Leone are D and G. This is how they look like.

Sierra Leone

In Sierra Leone, outlets of type D and G are in use.

Type D

Type G

Bahamas

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

Type A

Type B