You Do Need power plug adapter while traveling from East Timor (Timor-Leste) to Belize.

Here is Why You Need An Adapter

The outlet and plug type used in Belize are A, B and G and in East Timor (Timor-Leste) are C, E, F and I. This is how they look like.

East Timor (Timor-Leste)

In East Timor (Timor-Leste), outlets of type C, E, F and I are in use.

Type C

Type E

Type F

Type I

Belize

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

Type A

Type B

Type G