My main concern is the plug... nothing much to worry about.
Are you using Nikon charger?
On the backplate of any charger it must have a plate stating its operating range.
On my Nikon charger, it clearly states its operational from AC 100V-240V @ 50-60Hz.. That is, you can use the charger from Japan (AC100V) or America (AC110V), china (AC220V), Aust (AC240V) without a problem.
Main concern is that your plug in Aust is the 3 way triangular plug, it may be different in other countries. I'd suggest you get a univeral plug adapter to suit your need. Do a research on the type of plug they use in the country you are travelling to, then buy the adapter as needed.
Have fun for your trip