feinicks Wrote:it may work out.. if only to actively recharge battery. After all, wee have come some distance from solar powered calculators. But lets see what happens.

The thing is that calculators require hardly any power...

A typical calculator, on a small battery can like last for years.  How long can a typical MP3 player last on a battery?  A few hours?
MP3 players, for a start, need a much more powerful CPU, than one which only does addition/subtraction/multiplication/division about 2 times a second etc.