After the official release of iOS 26 on September 15, 2025, a growing number of iPhone users around the world began reporting a significant increase in battery drain. The complaints, which quickly spread across online forums and social networks, point to a faster energy drain than normal, even with moderate use of the devices.

In response to the demonstrations, Apple issued an official statement acknowledging the situation. The company clarified that the increase in battery consumption is an expected and temporary side effect, which should normalize within a few days after installing the new operating system. The main cause, according to the company, lies in an intense optimization process that takes place in the background.

The technical explanation involves a series of tasks that the system performs to adapt to the new software and user data. Esse período inicial de “adaptação” exige mais do processador e de outros componentes de hardware, resultando em um gasto energético maior até que todos os processos sejam concluídos e o sistema se estabilize por completo.

Understand the optimization that consumes your iPhone’s battery

One of the main reasons for high power consumption after updating to iOS 26 is the data reindexing performed by Spotlight. Essa system search tool needs to rescan all files, photos, messages, emails and applications to create a new search index, allowing results to be displayed quickly and accurately.

Simultaneously, the Fotos application starts a full scan of the user’s library. Esse process uses machine learning algorithms to identify faces, objects, pets, and scenes, organizing them into new memories and categories. Essa image analysis is computationally intensive and operates in the background.

Other native apps are also undergoing recalibration. New system features require apps to update their caches and data structures to ensure compatibility and optimal performance. Esse set of tasks, although invisible to the user, places a considerable workload on the device’s processor.

Finally, the operating system itself performs an integrity check and file optimization. Durante this period, the iPhone may heat up more than normal and the battery may run out more quickly, but Apple guarantees that this is a crucial phase for the proper functioning of iOS 26 in the long term.

Apple Intelligence and the impact on energy performance

The introduction of Apple Intelligence, the new artificial intelligence package from Apple, is cited as one of the central causes for battery consumption in iOS 26. Essa technology, deeply integrated into the system, performs a wide range of complex tasks that rely heavily on Neural Engine, the coprocessor dedicated to AI tasks. Após the update, the system begins the configuration and first execution of language and image models directly on the device, which requires continuous processing for hours or even days. Recursos such as creating custom Genmojis, image editing tools that remove objects from photos, real-time audio transcription, and Siri’s new contextual capabilities require the system to analyze user data to personalize the experience. Essa initial “learning” phase is one of the most resource-intensive, directly impacting battery life. Além Furthermore, integration with ChatGPT for more complex queries, even if optional, adds another layer of processing that contributes to energy expenditure, as the system needs to manage secure communication with external servers while processing the request locally.

Which iPhone models are most affected

The impact of post-update battery drain is not uniform across all supported iPhone models. Older Dispositivos, such as the iPhone 11, iPhone 12 and second generation iPhone SE, tend to feel the effects more pronounced. Isso is because its processors, while still capable, are less efficient at managing the intensive tasks of iOS 26 and Apple Intelligence compared to newer chips. The natural degradation of the battery over the years is also a factor that worsens the perception of shorter autonomy.

In contrast, newer models, such as the iPhone 15 line and the recently launched iPhone 16, equipped with A17 Pro and higher processors, handle optimization more effectively. The architecture of these chips is designed for superior performance in machine learning tasks and greater power efficiency, which allows background processes to complete faster and with less impact on battery life. Mesmo in these devices, greater consumption in the first few days is expected, but normalization tends to be faster.

Apple recommendations for users

To mitigate discomfort during the optimization period, Apple has released some practical recommendations. The main one is to keep your iPhone connected to a power source and a stable Wi-Fi network overnight. Isso allows the system to perform the heaviest indexing and analysis tasks without depending on the battery and at a time of user inactivity.

The company also advises that users avoid tasks that require high processing power, such as graphics-intensive games, editing 4K videos, or continued use of GPS navigation apps for the first day or two after the update. Dar the system a period of reduced activity helps speed up the completion of background processes.

It is important to emphasize that patience is essential. Battery recovery can take 24 to 72 hours, depending on the iPhone model and the amount of data stored. Apple advises against restoring the device to factory settings, as this will not solve the problem and will only restart the indexing process when the data is restored.

New features in battery-heavy native apps

In addition to Apple Intelligence, several updates to native iOS 26 apps contribute to initial power consumption. The Mapas app, for example, now offers detailed topographic routes for trails, requiring more intensive graphics and data processing to render these new maps and make them available offline.

In Apple Music, the new “AutoMix” function uses artificial intelligence to create smooth transitions between songs in a playlist, simulating DJ mixing. Para Therefore, the app needs to analyze the user’s music library to identify beats and tones, a task that consumes significant resources on the first run.

Recalibrating battery health

Another factor that can influence the perception of energy performance is the recalibration of the battery health measurement system. Grandes Operating system updates, such as iOS 26, often initiate a new calibration cycle to provide a more accurate estimate of maximum battery capacity.

This process, which also occurs in the background, may cause the battery percentage indicator to fluctuate unusually for the first few days. Recalibration is essential for long-term power management and the accuracy of the information displayed in the “Health of Bateria and Carregamento” section on the device’s Ajustes.

iOS 26 compatibility

iOS 26 is available for a wide range of devices, ensuring that many users will have access to the new features. The update is compatible with all models starting from iPhone 11, which includes the iPhone 12, iPhone 13, iPhone 14, iPhone 15 and new iPhone 16 models, as well as the second and third generation iPhone SE.