I'm not trying to sound silly, but do you know how to check the voltage? A lot of my American friends don't. It's super easy and can tell you if you need the voltage adapter or if you can just plug it into a plug adapter. My camera battery charger is dual voltage.
If you look at the written information on the charger it will say the voltage. I think American voltage is 100, but if it says something like 100/240v then it's dual voltage and can be used in either country without a voltage adapter. You just need the smaller plug adapter.