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If buttons on the mobile phone dial pad are made of piezoelectric material, they will deform when we press them. The resulting electrical voltage from mechanical deformation can be stored and used for charging the mobile phone.
m.salehi, Aug 20 2007
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Not practically. Piezo elements that small are only good for sensors.
peizo-electrics produce very little power, basically just enough to be used as a signal, not as a power source, also they produce extremely low voltage at high current, so converting it to be stored would be inefficient and probably a significant addition of weight and size to a cell phone