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I've noticed the trend but if you know the fine details please feel free to share.
In common consumer batteries, we saw the following evolution:
And then there's the lithium-ion rechargeable. You're probably reading this on a device powered by one. It's much lighter than NiMH for the same amount of energy storage, and a bit better on energy per volume as well. Since its introduction in 1991, Li-ion technology has dropped in price by a factor of about 25, which is why electric cars are commercially viable now and weren't a couple decades ago.
Unfortunately, consumer devices powered by standardized, field-replaceable Li-ion cells haven't really caught on outside of vaporizer hobbyists and flashlights.
compare a car battery thats lead based and heavy and not rechargeable, to the one in your cellphone that is more powerful and way thinner and safer.
The lead acid battery in your car is rechargeable
The battery starts the car and then the alternator charges the battery.
By what measurement is a car battery, at something like 75,000mAh and 500 or more cranking amps, less powerful than a cell phone battery?
energy density, depth of discharge, energy efficiency, lifespan