http://www.nintendowiiclassiccontroller.com/nintendo-wii-classic-controller/nintendo-wii-classic-controller
One of the most popular Wii accessories that can be purchased is the Nintendo Will Classic Controller. When you buy the Wii gaming system one of these controllers is included in the box.

The Nintendo Will Classic Controller come with standard batteries. They also come with rechargeable battery packs for your Nintendo Wii Classic controller and then when you are not using them you can recharge them.