Battery replacement
HI How do I get my phone diagnosed to see if replacing a battery would work?
iPhone 6, iOS 12
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iPhone Battery and Performance - https://support.apple.com/HT208387 - about power management, battery life
- For iPhone 6 and later, iOS 11.3 and later add new features to show battery health and recommend if a battery needs to be replaced. These can be found in Settings > Battery > Battery Health.