You Do Need power plug adapter while traveling from Burundi to Niger.

Here is Why You Need An Adapter

The outlet and plug type used in Niger are C, D, E and F and in Burundi are C and E. This is how they look like.

Burundi

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

Type C

Type E

Niger

In Niger, outlets of type C, D, E and F are in use.

Type C

Type D

Type E

Type F