From the headline I thought it was related to a video I saw years ago for a television remote control from a French (I think) hardware engineer. It was only a p

From the headline I thought it was related to a video I saw years ago for a television remote control from a French (I think) hardware engineer. It was only a prototype but it replaced the batteries with a piezoelectric mechanism that generated enough of a charge from physically depressing the button to send the infrared signal. Probably not enough power there to reliably send a bluetooth signal though.