We also know that robotic carpet cleaner make noise and sound

We all know that noise is energy, and it takes energy to make sound. We also know that robotic carpet cleaner make noise and sound, and we should be collecting that noise, rather than letting it go to waste, or irritate us. Since the little Rumba vacuum cleaner, although it doesn't make much noise, it does make some, therefore we should recapture it, the noise that is, and use it to trickle charge the battery. Next, we know that if we rub our feet on the carpet and then touch something we let off a shock. This is because we are trading electrons with the carpet due to the friction we create.

We do know that a Rumba running across the floor and the carpet will pick up that static energy from the friction as well. And there's no reason it couldn't charge the battery with a trickle charge each time it shocks itself. Now then, if we were to do this, we would be recapturing some of that lost energy, therefore the Rumba robotic vacuum cleaner could go longer between charges, meaning it could vacuum for a longer period of time before it goes and docks back up to its recharging station. How much would these new features cost to implement in each new robot vacuum cleaner?