Last time I bought a refurbished phone (2 year old Pixel) the battery was shot out of the box, and I returned it.
A year later, my brother bought and returned 3 of them before buying a new Moto G7, because the batteries were all shot in these phones.
Some years back I had a Galaxy S2. When the battery started to go, I bought a new one. It must have sat on the shelf for a while because it wasn't any better than the one in the phone. I figure they're all made around the same time, and I doubt anyone keeps making batteries for phones much longer than they're in production.
Moral of the story: I don't know. Perhaps it's that there's a certain amount of planned obsolescence and a certain amount of obsolescence through neglect with phones, and I haven't yet found a way to come out ahead other than to not use one. I need to use mine extensively for work however, so I have a new phone.
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