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If they can produce this cheaply enough and if it doesn't need too much shaking to make it work it could revolutionize children's toys. A lot of kids carry around their toys a lot in comparison to the amount of time the electrical parts are actually in use, so there should be ample charging time. Lots of toys only need their batteries replacing every six months to a year, so I assume they are fairly low drain and would suit this well.

Edit: Battery compartments that children cannot get into a also no doubt a part of the manufacturing cost, so batteries that never need replacing that can truly be built into the toy wouldn't need battery compartments and could simplify design.

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