@NoSprings - What metric are you using to justify your assumption that batteries are NOT significantly improving all the time? The capacity/number recharge cycles/stability/etc. of today's batteries are light years ahead of those available even 20 years ago.

It takes at least 5 or 6 years before any discovery makes it into any products, it is often longer, much longer. This is true for discoveries in electronics, pharmaceuticals, energy production, almost every facet of our society. That's just the way it is.

Here's hoping that battery technology moves beyond Li. Between electric vehicles and the power storage needed to make renewables a 24/7 source of electricity I don't think that there is enough Li on earth to fulfill all of our requirements.

"The scientists explained that uneven movement of lithium could have lasting, damaging effects because it strains the structure of the active materials in batteries and can lead to fatigue failure."
The same as any lead acid battery...