While it may not match the energy density of lithium-ion batteries, its storage capacity doesn’t diminish irreversibly over time, making it capable of an exceptionally long lifespan as it can be regenerated.
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That’s big, all by itself.
Having to throw away (er.... recycle) lithium batteries after 5 years or so is lame. So these batters may be a little bulkier, which could be annoying for smaller devices or hand power tools, but would be awesome if they lasted.
Much more than a little bulkier, the current device batteries you are thinking of like smart phones literally are the reason for the size limitations of the devices, most of the device size is battery dependent.
So literally your device would end up over 3 times bigger since the energy density is 3 times less.
Plus how in the hell will you handle a smart phone or laptop that is 200 to 400 Celsius required to maintain the battery.. LMAO, sorry but mostly useless at this time for any real world applications!