I love the idea of using those extra cells for solar or perhaps renting them. I can't see why no one is exploring this gap in the market. It might only appeal

I love the idea of using those extra cells for solar or perhaps renting them. I can't see why no one is exploring this gap in the market. It might only appeal to nerds at first but that is true with most technologies in their infancy. We need what is effectively a giant version of a double AA battery. Yes we also need battery management systems and heating/cooling to go with these things but these are solved problems, just not standardised yet. Please someone take note and do this!