Why, of all parts on a phone, would you expect the battery to be the one that's already good enough that it should never need to be upgraded?
"Battery capacity" is like the one thing phone manufacturers still try to improve.
"Battery capacity" is like the one thing phone manufacturers still try to improve.
Besides it's pretty easy to get custom battery pouches made.
For older phones, the batteries we buy are likely also old stock left over if we can find some in stock anyway, right?