How? Apple doesn't sell spare parts. I went through two battery replacements on my iPhone SE 1G, after the original battery died. One from iFixit which was terrible. Battery SoC and performance was always wonky with that. Another from a reputable spare parts seller here, which had Apple branding on it, and it started good, but soon developed the same problem as the first.
Given Apples hostility toward repairs, it's obvious they'd rather you throw your device into the ocean and pay for a new one.
By "official replacement" I meant taking it to the store and having them do it. My wife recently got a battery replacement at the Apple Store, around $100. Paying that every 2 years is a lot cheaper (and better for the environment) than buying a new $1000 phone.
How? Apple doesn't sell spare parts. I went through two battery replacements on my iPhone SE 1G, after the original battery died. One from iFixit which was terrible. Battery SoC and performance was always wonky with that. Another from a reputable spare parts seller here, which had Apple branding on it, and it started good, but soon developed the same problem as the first.
Given Apples hostility toward repairs, it's obvious they'd rather you throw your device into the ocean and pay for a new one.