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An exponential increase in power density of batteries.
This was literally in the post under this one: https://www.notebookcheck.net/Lithium-metal-battery-with-over-500-Wh-kg-developed.862073.0.html
I just want reliable long-term storage. Even if it's a trickle of power coming out, I want it to be reliable and large, so that I can just throw energy at it when I don't need it and can rely on it when I do.
Fair. I was thinking if a loaf of bread sized battery could run my car for 100 miles, I would have zero range anxiety. Make them easily swappable so people no longer charge their battery on road trips, they just drive up to a station, swap, and continue on their way. Maybe with an extra loaf or two in the trunk if going far from stations.
Storage size and longevity aren't as important to me once it becomes dense enough I can carry all I need for a day in my purse.
That's energy density, not power density. https://www.energyeducation.ca/encyclopedia/Energy_density_vs_power_density
If a loaf sized battery could hold 100 miles, I'd put 100 of them in a car and only recharge them every 10000 miles.
I'd be okay with how long it would take to charge.