How long should users wait for iPhone battery to adjust after iOS 15.4?

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Users should wait 48 hours for their iPhone to adjust after updating to iOS 15.4.

Following the release of iOS 15.4, some iPhone users have reported a significant decrease in battery life. Apple Support suggests that this battery drain may be temporary, with devices requiring approximately 48 hours to adjust to the new software. This adjustment period allows the iPhone's apps and features to adapt to the updated operating system.
Post-Update Battery Adjustment Period

Apple Support has indicated that battery life concerns after updating to iOS 15.4 could be attributed to the time it takes for apps and features to recalibrate. This recalibration process is a normal part of major software updates, where background processes may consume more power initially. Users have been advised by Apple to allow up to 48 hours for their iPhones to settle after the update.
Normal Battery Drain vs. Genuine Issue

While a temporary increase in battery consumption is expected, it is important to distinguish this from a persistent issue. The 48-hour waiting period is intended to allow the device to return to its usual performance levels. Should battery drain persist beyond this adjustment phase, it might indicate a more significant problem beyond the typical post-update recalibration.
General Battery Maximisation Tips

In addition to the post-update adjustment, Apple provides general guidance for optimising iPhone battery life. These tips, available on Apple's support website, include managing app background activity, enabling low power mode, and adjusting screen brightness. While updating to the latest software is often recommended for bug fixes and new features, the immediate impact on battery life can sometimes necessitate a brief waiting period for the system to stabilise.

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How long should users wait for iPhone battery to adjust after iOS 15.4?

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