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8BitDo Reveals Gamecube Controller Mod Kit & Wireless Receiver
(retrododo.com)
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But the Wavebird came out after the original GameCube controller so it seems like a regression. I imagine there was some legitimate reason for it, like the battery was already dying too fast.
Considering used AA batteries I would say that battery was definitely a factor. It basically brought in the era of wireless controllers, though, so I’d say it was pretty good.