How do I know if my iPhone needs a new battery?

Just go to Settings > Battery and tap on Battery Health. The problem here is that following the replacement by a non-Apple provider, the Battery Health screen in Settings will display a “Service” message rather than information about your battery health.

Despite the “Service” message the iPhone  battery will work as normal – it isn’t being throttled by Apple. But this will nonetheless concern anyone who is considering a battery replacement.

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