To be fair, pages like the one you link only talk about the official standards, which mean very, very little in most of the world.

I wouldn't assume anything about voltage in much of South America / Africa / Asia. You're going to get a frankenstein NEMA-Schuko-Chinese power outlet that will give you some amount of power for some amount of hours in the day, for a definition of 'some' that no one will be able to specify for you with any great precision and that will vary from town to town.