The Wii nunchuck doesn't even need any batteries. To use the nunchuck controller you simply plug it into the Wii remote

, and the nunchuck is powered by the Wii remote controller's batteries.

Why is my Wii Nunchuck not working?

If the Nunchuk isn't responding, it will need to be replaced. ... If multiple Nunchuk Controllers don't work on the same Wii Remote, or if the Nunchuk works in another Wii Remote, then there is likely a problem with the port on the Wii Remote.

How do you charge a Wii nunchuck?

Remove the back cover from the Wii remote and the batteries within. Connect the Wii remote rechargeable battery pack in the batteries and cover's place. It pops in just like the back cover. Plug the charging dock into an open electrical outlet, and set it on a flat surface.