Once the batteries are properly inserted into the charger, the charger inserts into any 110 vac outlet. Did I understand your question properly? Some chargers will work with European 220 vac round pin outlets, but mine does not.
What you are questioning is just the extra batteries. I purchased those plus the complete charger and battery kit which charges aa or aaa batteries. Item # is CHP4WB4A -charger and 4 batteries included. works great.