Using electronics in Japan

Usual pre-trip questions...
Other than Plug converters, I've heard some issues with getting stuff to work in Japan, lap top chargers, iphone, camera battery chargers etc.
I've got an empower converter which I'm in two minds about lugging about, as unlikely to need on the flight. Would this be worth taking?
Any advise?
NH
Other than Plug converters, I've heard some issues with getting stuff to work in Japan, lap top chargers, iphone, camera battery chargers etc.
I've got an empower converter which I'm in two minds about lugging about, as unlikely to need on the flight. Would this be worth taking?
Any advise?
NH