A wii is connected to the plug socket and the controllers take 2x AA batteries each
No, it uses Wii remotes (that need batteries) but I think the microphone plugs into the back of the Wii.
the Wiimote uses 2 AA batteries, or a rechargable battery pack if you wish to save money in the long run.
You don't have to buy one. The Wii Remote is designed to use two AA size batteries. The charger packs are a convenience, as you don't have to go out and get new batteries every few hours of gameplay.
No, the Wii Nunchuk doesn't require batteries. It is wired and is connected to the Wiimote. However you do need batteries for the Wiimote itself to work. There are some wireless nunchuks from third party companies that require batteries though.
The best is to get rechargable batteries for the Wii Nunchuk. You can use AA batteries, but they die quickly.
It uses 4 double a batteries.
The Wii Fit Balance Board (if you can get one) uses 4 AA batteries.
Rechargable batteries are fine to use in Wiimotes, but if you want a longer term solution try looking into a battery pack built for the wii.
I use rechargeable batteries in both my Wiimotes. For one of them I have a special rechargeable pack that recharges through a lead fed from the USB on the back of the Wii console - but the other one I just use standard NiMH rechargeables in. Never had any trouble with either.
double A MAXELL ALKALINE BATTERY on battiers wii comes with its in japenese writing!
WII remotes are electrical devices which consume power. All devices which use energy require a source for this energy. Wii decided that batteries made the most sense for the energy source.