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Outside of replacing it when it’s dying, is love to have phone batteries in an external charger. Forgot to charge overnight? No problem, swap a fresh one in. Going on a long vacation and lacking a portable charging brick? Bring some spares. Friend’s phone dying and your battery is compatible? Loan it to them.
Nooooo you must buy zillion separate device from company. Don’t forget a few adapters because obviously nothing is ever compatible. And every few years: let’s invent a ‘new’ thing and have everyone upgrade their devices!