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The battery needs to be charged to attach or remove it, then?As has been stated here previously, they can use an electropermanent magnet so that there only has to be one electrical pulse to turn it on or off rather than a continuous use of electricity to keep it on.
One so strong it holds them in place risk finger injuries, too.
I do think magnets are involved, sure why not, but I don't think they're involved in the way people seem to be imagining; as the main way the controllers are affixed to the console, rather than just an additional measure to keep them in place.