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Adding a single layer of 18680 cells to my phone would increase battery capacity six times at cost of extra 300g in weight and +18mm in thickness, perhaps less if we're removing regular battery and reorganizing internals. This would allow it to be charged every 10-15 days, perhaps more, and it's still reasonably sized
Literal brick sized phone would increase battery capacity 30-50x which would be good for charging once per two to three months, that's probably more than enough, and taking it abroad plane would be prohibited
Shoebox sized battery pack (33x21x13 cm) would fit 378 18680 cells, which at 18.9kg and 1200€ would be 1320Ah, which should be good for two years or more on a single charge, and it stores more electrical energy than 4kg of TNT releases when exploded
I think the biggest downside is the fact that you wouldn't be able to carry it on an airplane