That is just a part of the problem.
Life expectancy? Energy density is great, but it’s also like putting a 100 gallon gas tank on your car. Sure, you can drive 2,000 miles between fill-ups - but you are dragging a lot of weight along with you, aren’t you? Even if you are only driving 50 miles, you are carrying nearly 1,000 lbs. of extra weight in your vehicle, constantly.
We have made more progress in battery development in the last 20 years, than in the last 150 years; which is excellent. Lithium Sulphate looks very promising, but the Holy Grail is light weight, non-violatile, near infinite deep cycles, near indefinite storage life, cheap, fast charging and not made out of Unicorn fur.
“Life expectancy? “
Present batteries are expected to last 20+ years. Tesla has been testing a battery that could last several decades.
Wow, 1000 lbs is about 160 gallons of gas, which would take you easily across the country at 20 mpg, or about 4000 km. That’s about a 70:1 ratio, gas vs. battery, as a storage medium by weight.
Pretty hard to steal the extra 1000 pound of battery.