Last night Apple released the second Beta of iOS 11.3 to developers. It’s notable in that it lets us have a first look of Apple’s proposed solution to how we can monitor our Battery Health and control what Apple is calling the ‘Peak Performance Capability’ of our iPhones.
Apple has been very verbose to label this ‘Beta’ within the release so expect things to change, but see what we have.
For iPhone 6 and later, iOS 11.3 adds new features to show battery health and a recommendation if a battery needs to be replaced. These can be found in Settings > Battery > Battery Health (Beta).
maximum battery capacity • Performance is normal
If your iPhone suffers an unexpected shutdown, the performance management features will be applied, you’ll see this message:
This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power. Performance management has been applied to help prevent this from happening again. Disable…
Note that if you disable performance management, you can’t turn it back on. It will be turned on again automatically if an unexpected shutdown occurs. The option to disable will also be available.
Performance management applied • Battery health unknown
If you disable the applied performance management feature, you’ll see this message:
This iPhone has experienced an unexpected shutdown because the battery was unable to deliver the necessary peak power. You have manually disabled performance management protections.
Performance management turned off • Battery health degraded
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