Electric plug NZ to Japan

We are travelling to Japan in 2 weeks time, and will bring our Panasonic Lumix FZ18 which we bought in NZ. The battery charger 's label says that it is dual-voltage, it accepts 110-240V. But the voltage in Japan is 100V. Do I need to buy a step up transformer? Should I get it in Japan airport or in NZ?

I have also bought a universal plug, but its labels says the electric rating is 125V 6A, 250V 10A. Again, do I need a transformer before using this universal adapter?

Can anyone help?

It will work as it is, no problem.

Thank you, Sandy. Do you mean that both the universal plug and the digital camera battery charger would be working just fine on Japanese 100V electricity? Please kindly clarify.

I have a Lumix too, different model but a FZ. The charger worked fine but I think that it took a bit longer than in North America.

Yes, the universal plug and the digital camera battery charger would be working just fine on Japanese 100V electricity.

The battery will not take any longer to charge because it is a switch-mode charger which uses any voltage between 100-240V, but still outputs the same voltage (4.2V)