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If these types of batteries pack so much power for a small size why haven’t they begun being used in place of traditional car batteries in new vehicles? Is it a cost or some other reason why they’re not being used in this way?
What are the traditional car batteries, you think?
Rechargeable batteries used in electric vehicles include lead-acid ("flooded", Deep cycle, and VRLA), NiCd, nickel metal hydride, lithium ion, Li-ion polymer, and, less commonly, zinc-air and molten salt batteries.
The next generation - fluoride-ion batteries it is developing stage already. Owing to the low atomic weight of fluorine, rechargeable fluoride-based batteries could offer very high energy density.
Oh, you meant non-electric cars....
Well, for regular cars lithium ion batteries are very expensive for the same energy storage as compared to lead acid which are relatively cheap. Lead acid battery are also very good at delivering very high current required for the starter motor. When completely discharged, even once - lithium ion bank can render your entire pack permanently dead. https://www.linkedin.com/pulse/lead-...es-robert-bean
I know they have experimental batteries that are small and hold a lot of power for a long time. My brother and some friends borrowed a couple of dozen of them from a university to build an electric wave runner for a makers faire competition (they did not win because they lacked puppies). Each battery was nut much bigger than a well stuffed wallet. I think they had 20 -25 of them and they provided sufficient power to turn the wave runner at about 25 mph for five to seven hours.
It's not cost so much as weather. Crank your car in subzero weather and then have the alternator charge it back up just once and you'll destroy, possibly catastrophically, most lithium chemistries. EVs have battery warmers and intelligent battery management systems to keep large batteries healthy in extreme conditions, but a lithium battery just large enough to start a car isn't going to provide the energy to keep itself warm for several days or weeks of sitting in winter, and the complexity of management isn't worth it with small batteries.
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