After the arrival of iOS 26iPhone users in Spain, the rest of Europe, and other markets have begun to notice that their batteries are draining significantly faster than before the update. On social media, tech forums, and specialized communities, comments have multiplied from people who, with similar usage patterns, are seeing how Autonomy clearly declines throughout the day.
Faced with this scenario, Apple has come forward and admitted the problemHowever, the company clarified that this is not a system failure, but rather an expected side effect. According to the company, it is normal for the iPhone to consume more power than usual during the first few days after installing a major update like iOS 26 due to an intensive internal optimization process running in the background. This process should be completed within 24 to 72 hours, depending on the amount of data and device usage.
Why does iOS 26 cause a spike in battery consumption immediately after updating?
Apple explains that, right after installing iOS 26, the system initiates a series of maintenance tasks and internal reorganization These are processes that the user doesn't see, but which require significant computing power. The goal is to adapt all data, apps, and services to the new operating system structures so that the newly launched features work smoothly in the medium and long term.
One of the key elements of this process is Spotlight, the built-in search engine of iOSAfter the update, the iPhone re-indexes virtually all local content from scratch: files, emails, messages, notes, apps, and even internal app data. This new index allows for faster, more contextual searches, but for the first 24-72 hours it involves heavy CPU usage and, therefore, a significant increase in battery consumption.
In parallel, the application Fotos performs a massive analysis of the entire photo library to recognize faces, pets, objects, scenes, and places with more advanced algorithms. This information powers the smart searches, automatic collections, and enhanced memories introduced in iOS 26. Reclassifying thousands of photos and videos can take several days and is one of the silent processes that demands the most energy during the initial phase.
The system also returns to learn user usage patterns To fine-tune energy management and performance, iOS 26 again tracks when the phone is used most, which apps are opened most frequently, and which background processes can be paused without impacting the user experience. This "training" period requires additional resources initially, but theoretically allows for an improved balance between battery life and performance once completed.
In addition, many third-party apps that tend to drain the battery They go through their own silent adaptation phase. The system checks for compatibility with the new iOS 26 APIs, adjusts permissions, reviews how they work in the background, and applies the new power-saving rules. All of these operations are concentrated in the days following the update, which explains the spike in power consumption that so many European users are noticing on their devices.
Apple Intelligence: the new AI layer that also drains the battery
One of the big changes in iOS 26 is the addition of Apple IntelligenceGenmojis is a suite of generative artificial intelligence features deeply integrated into the system. This extra layer is responsible for a more contextual Siri, more advanced assisted typing options, improved editing tools in Photos, and the creation of custom Genmojis, among other new features that Apple has been detailing.
Unlike many AI solutions that rely almost entirely on the cloud, the company is betting on an approach where Much of the processing is done on the iPhone itself.This approach strengthens privacy—because less data leaves the device—and reduces dependence on the mobile connection, but it has an obvious cost: the main chip and the Neural Engine work harder than usual, especially in the first few days after the update.
During this initial phase, Apple Intelligence needs analyze emails, messages, usage habits and local content This is to generate summaries, text suggestions, more accurate Siri responses, and contextual recommendations. All of this calculation runs in the background and adds to the already intensive reindexing and calibration processes of iOS 26, resulting in a significant increase in energy consumption.
Behind eye-catching features like the creating custom GenmojisWith new AI-powered photo editing options and improvements to text writing in Mail, Pages, and other apps, there are models that are downloaded, optimized, and adjusted to the actual usage of each device. While these models adapt to the usage pattern, the system demands more CPU, GPU, and Neural Engine resources, which the user perceives as a decrease in battery life.
In some cases, iOS 26 even resorts to External models for particularly complex queriesThis combines processing on the iPhone itself with advanced AI services via the cloud. Although most of the heavy lifting is done locally, this hybrid interaction adds more background operations and contributes to battery drain being faster than many users are used to during the first few days of heavy Apple Intelligence use.
Revamped native apps and their impact on battery life
The increased power consumption doesn't depend solely on the base system and Apple Intelligence. Several of the iOS 26 native apps have received profound changes and new features that also need an adjustment phase after the update is installed.
La app PhotosIn addition to improved recognition of people, pets, and objects, it reorganizes the library with new collections, highlights, and enhanced memories. For those who accumulate years of photos and videos on their iPhone, this analysis and reclassification process can take several days, with the phone working in the background as long as it has sufficient time and battery.
En Apple MusicThe standout feature is “AutoMix,” which uses artificial intelligence algorithms to create smooth transitions between tracks, emulating the work of a DJ. To achieve this, the app must analyze and tag the user's music library, identifying rhythms, intensities, and mixing points. This analysis, which mostly runs in the background after the update, represents another source of additional resource consumption while it completes.
Application Maps has also been reinforced with more detailed topographic maps and improved offline routes. If the user decides to download large areas for navigation without mobile data, the iPhone has to manage large downloads and process the new maps, processes that are usually scheduled when the device is connected to Wi-Fi and the charger, but which still impact battery life if they coincide with daily use.
Alongside these apps, other native tools rely on the new ones Artificial intelligence and energy management APIs In iOS 26, the system needs to adjust how each application behaves in the background, which permissions it keeps active, and what priority it is given compared to other processes. This is all part of the same "fine-tuning" phase that explains why, for a limited time, battery consumption is noticeably higher than usual.
iPhone models where the problem is most noticeable
Although the overall behavior is similar across the entire compatible range, the The impact of extra consumption is not distributed equally. among the different iPhone models. What we're seeing among users in Spain and other European countries is that older devices are experiencing this initial spike the most.
Devices such as iPhone 11, iPhone 12 or iPhone 13 They still have very capable processors, but they aren't as efficient as the latest chips, nor do they have such an advanced Neural Engine for artificial intelligence tasks. To complete the same volume of reindexing, photo analysis, and machine learning processes, these models need to work longer and under a heavier load, which translates into more heat and a more significant drop in battery life during the first few days with iOS 26.
At the opposite extreme, the most modern models, especially the latest range of iPhones with next-generation A-series chipsThey are designed with an architecture focused on efficiency per watt and with more powerful neural engines. This allows them to handle the same optimization tasks in less time and with lower energy consumption, so many users barely perceive a drastic change or notice that the situation stabilizes much sooner.
Another element that makes the difference is the battery health status of each deviceOn older iPhones, where maximum battery capacity has naturally decreased, any increased workload is more noticeable. In these cases, users often need to charge their devices more frequently during the iOS 26 update process.
In addition, Apple has defined which mobile phones can take advantage of all the Apple Intelligence options. The most advanced AI features These features are only activated on iPhones with sufficiently modern hardware, precisely to prevent older models from being overwhelmed in terms of performance and battery life. Older devices receive the general improvements of iOS 26, but with a scaled-down version of some smart features.
iOS 26 compatibility and features reserved for recent models
Upgrade to iOS 26 is available for free It's compatible with a wide range of devices, including most iPhones currently sold in Europe and several older models. However, the experience isn't identical across all of them, either in terms of performance or the number of new features.
Apple has made it clear that the Apple Intelligence's most demanding features Features such as advanced content generation capabilities, certain deep customization options, and more complex Siri integrations with user context are restricted to iPhones with the latest chips and Neural Engine. The goal is to maintain a smooth experience and prevent the device from being constantly stressed, with the resulting impact on battery life and temperature.
In practice, this means that a compatible but older iPhone can install iOS 26 and benefit from security and stability improvements, as well as some visual and usability enhancements, but will run with a a more limited version of certain AI functionsOwners of the latest generation models, meanwhile, have access to the full Apple Intelligence package, with the caveat that during the first few days they may more clearly notice the peak in power consumption associated with the learning and adjustment phase.
This phased approach allows Apple expand the number of compatible devices without forcing less powerful models to run workloads that are not designed for their hardware, which could result in a worse experience in both performance and daily battery life.
Apple's tips for reducing battery impact
To make this entire adaptation process as smooth as possible, the company has shared a series of practical recommendations for iPhone users in Spain and Europe. The main one is as simple as it is effective: leave the device connected to the charger and a Wi-Fi network overnight for several days after the update.
When iOS detects that the iPhone is plugged in and has a stable Wi-Fi connection, it interprets this as meaning it can run the heaviest tasks of indexing, analysis, and downloading without worrying about battery life or mobile data consumption. This allows much of the optimization work to be done while the user sleeps, reducing the impact during active hours and shortening the period of high data usage.
Another recommendation that Apple considers useful is, to the extent possible, limit the use of very demanding applications During the first 48-72 hours after installing iOS 26, games with advanced graphics, video editors, or augmented reality apps put a high load on the processor and GPU, just when the system is already busy with intensive background processes.
The company also encourages users to review the section “Battery” within SettingsThis shows which apps are consuming the most energy and by how much. It's normal for the operating system itself to be among the top users in the days following an update, but this view can help identify specific apps that, perhaps because they aren't yet fully adapted to iOS 26, are draining more battery than is reasonable. In these cases, updating the app or restricting its background activity can make a difference.
On more than a few occasions, a simple iPhone restart Waiting one or two days after an update helps close any stuck processes and speeds up system stabilization. It's not a miracle cure, but it's a simple measure that, combined with the other recommendations and a little patience, can help battery life return to normal sooner.
The message Apple is conveying is that The spike in battery consumption after installing iOS 26 is a known and temporary effectThis is due to data reindexing, power management recalibration, the deployment of Apple Intelligence, and the adaptation of native and third-party apps. According to the company, once this optimization phase is complete, battery life should typically return to levels similar to the previous version or even improve slightly in some models, provided the battery health remains good.
