Why are iPhone users reporting poor battery life after iOS 15.4 update?

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iPhone Users Report Diminished Battery Life Following iOS 15.4 Update

Reports indicate a noticeable decline in iPhone battery performance for some users after upgrading to iOS 15.4. These users have described scenarios where their devices struggle to last a full day on a single charge. One user specifically mentioned their iPhone 13 Pro Max, which previously held a charge for several days, was depleted to half capacity by midday after the update.
Post-Update Adjustment Period

Apple Support has suggested that battery performance issues following a major software update can be attributed to the device's apps and features requiring a period to adjust. This adjustment phase is a common occurrence as the operating system integrates new functionalities and optimises background processes. The company's guidance indicates that allowing approximately 48 hours for the iPhone to settle post-update may resolve these reported battery drains, a timeframe some internal observations suggest could be accurate.
General Battery Optimisation Guidance

In response to user concerns, Apple has also directed individuals to its official resources on maximising battery life and lifespan. These recommendations include practical advice such as avoiding extreme ambient temperatures, which can affect battery chemistry and performance. The guidance also suggests enabling features like low power mode, which reduces background activity and visual effects to conserve energy, and utilising auto-brightness to dynamically adjust screen luminosity based on ambient light conditions, thereby reducing power consumption.
Battery Optimisation Paradox

Ironically, one of the primary recommendations Apple provides on its own battery optimisation page is to update to the latest software version. This presents a paradoxical situation for users experiencing battery drain directly after an update, as the very act of updating is also promoted as a solution for battery longevity. While some users within the same office environment did not report significant battery issues after updating to iOS 15.4, the varied user experiences highlight the complexities of software updates and their impact on device performance.

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Why are iPhone users reporting poor battery life after iOS 15.4 update?

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