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YouTuber "NightHawkInLight" just made a flow battery from common materials. Why would I want a solid state battery when I could have a battery whose capacity expands just by duct taping plastic water barrels to it?

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For storage at the level of a home or a grid-level battery, absolutely.

Li-Ion is dominating because of the amount of inertia and economies of scale it has. But if we assumed equal amounts of R&D and investment you'd expect a future of solid state batteries for mobile applications and flow batteries for stationary applications

What's the energy density for that? Something that works doesn't mean something is desirable

Is energy density required for all applications? Something that's not desirable for say a car doesn't mean something isn't good enough for say non-mobile applications.

Well, yes actually. If you're talking any kind of batteries above Duracell level, then it's important to understand how much power can be stored in a given "unit"

Of course you need to know the power per unit to some degree, but when you're building warehouse-sized stationary storage arrays, land is cheap and LCOS is more important than energy density. That's a very different tradeoff calculation than if you're building a car.

Hold on, buying Lemon calls.

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