How do you think the "new batteries" would interact with the camera? Just because you hop islands in the sea, does not force you to change your lenses, batteries, color dresses, ...
All you need to be able to do is mate your stomach to new food and your battery charger to new mains voltage. So do look at your charger carefully. It probably says 100 - 250 V on there someplace. If it does you are fine everywhere on earth. If it says 127 V or 117 V or some such limited US voltage on there, you are in trouble with that charger anywhere else on this globe. Physics 101 never taken, I am afraid. But I am almost 99 % sure that your charger will be "universal" as all of them are nowadays. DO LOOK, however.