If they were able to produce a battery of similar size of today's batteries that would provide 10 times the charge, then the manufacturers would just reduce the size of the device further.
Thinner and lighter with a battery the size of a dime but with the capacity of today's batteries. That is what they have been doing.
Soon the devices will be able to double as razor blades they are getting so thin. You will have a whole tablet built on a thin sheet of glass with a battery the size of a flea's leg.
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