If you own a battery-electric vehicle, then you could directly power the Amplifier in your living room by connecting it to your car. That way you could use your car's reserve battery to power your Stereo set-up rather than plugging it back into the grid. However, there aren't many All-in-one Streaming Stereo Amplifiers yet that can power directly through a DC supply or have an in-built battery over an AC supply.
LOL!
EVs are not exclusive of the National GRID, to charge them, you need to plug it into the network. It still requires fossil fuel dependency from the National GRID. EVs source energy from that grid that uses fossil fuels which again contributes to greenhouse emissions.
Electric cars may not produce tailpipe emissions but they still contribute to emissions. EVs emit harmful gases when they are manufactured. They also use unsustainable materials and methods of extraction to access these materials. Another source of emissions is the batteries – Electric cars are fitted with lithium-ion batteries that use a lot of energy and raw materials.
Finally, there’s no fully sustainable way of recycling these batteries yet, although, there are ways to
re-purpose these batteries for other uses once they become inefficient for electric cars. I think this is what you were alluding to, perhaps someone can come up with ways to customise batteries for HiFi?