[gbgb]

Hi Ali:

I agree with Joan that the charger MUST say that it will work with 100 volts. If it is an UK only model , ie it is 230 ( or 240 volts) volts it will not charge your batteries in Japan. If it is an international model it will likely work.

See if you can post a picture of the charger information plate in the forum. We can tell for sure.

You will also need a mechanical converter for your plug  or a different line cord, of course. Japan uses a small (compared to the UK!) two prong non polarized plug.

There is potentially a further problem. Many airlines will give you a problem with deep cycle batteries. They may require gell batteries. These are batteries where the liquid electrolyte is a gelled electrolyte that will not spill if the battery is broken open. Some airlines will accept liquid electrolyte but will remove the batteries and double bag them.