A lot of folks are being dismissive of batteries with a longer life, because devices that use batteries also become obsolete; conveniently, it happens on about the same schedule for some people.<p>But, that misses the point. A battery that lasts dramatically longer means you can deploy batteries in ways and places that couldn&#x27;t be deployed before, and you can use them in ways we don&#x27;t currently think &quot;I know, I&#x27;ll use a battery!&quot; Power for the grid is one of those areas. We don&#x27;t store generated power right now, because it is too expensive. Partly it is too expensive because batteries are inefficient and horribly short lived. A battery that lasts 25 years could be matched with solar panels that last 25 years (or more) to provide a very effective replacement for grid power. This is just my own take on what a much longer lived battery might be used for. I&#x27;m certain there are tons of implementations that aren&#x27;t obvious to me.<p>Even if a battery with a 20 year life cycle never makes it into a phone, it would still be revolutionary.