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The tradeoff for sealed batteries was significantly improved ingress protection, larger charge capacity, and lighter weight.

The market spoke and nobody seems to really care that much about user replaceable batteries except a vocal minority.

That and the fact that with phone trade-in programs from manufacturers, batteries are much less likely to be disposed of inappropriately.

CAT has sold phones with replaceable batteries and good ingress protection.

They aren't particularly light or sleek though.