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.
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Wii remotes need two double A batteries to work.
Wii remotes run on 2 AA batteries but if you can get a pair of recharable batteries then yes you would need to charge them. (Pick your brand carefully, some batteries run out fast!)
Most games require a separate Wii remote for each player. For single player games you only need one remote. You can connect up to four Wii Remotes to a single console, or three Wii Remotes and a Wii Fit Balance Board.
at least one! if you want to play all the instruments at the same time, use the number of wii remotes to instruments
You need to press the 1 and 2 buttons at the same time with all Wii remotes.