OnePlus Watch 3: Launch, review, and comparison of the smartwatch with the best battery life in 2025

OnePlus has taken a strategic step in consolidating its technology ecosystem, presenting one of the most ambitious and comprehensive offerings in the smartwatch sector with Wear OS . The OnePlus Watch 3 not only improves upon previous generations but also redefines the standard for battery life, premium design, and advanced health features, positioning the brand to compete head-to-head with giants like Samsung, Apple, Xiaomi, and Huawei.

OnePlus 's history in the wearables sector is marked by its philosophy of progressive growth and user focus. Initially, although rumors and expectations about a OnePlus smartwatch had existed for years, the company concentrated its efforts on perfecting its smartphones and building a solid user base. This decision has been key to maturing its ecosystem, culminating in the launch of the highly anticipated Watch 3, which represents the culmination of a holistic vision of connectivity and digital wellbeing.

In the following sections, we'll take an in-depth look at every aspect of the OnePlus Watch 3: from the development process and all the launch challenges to its comparison with direct rivals, focusing on its battery life, sensor quality, operating system, sports features, and customization. We'll also cover deals, accessories, and everything else you need to know before making the jump to OnePlus' flagship smartwatch.

The desire to see a OnePlus smartwatch is a long-standing aspiration among fans of the brand. The first rumors date back a long time, when it was leaked that the company was working on designs and prototypes, although the project was put on hold in favor of strengthening its position in the mobile sector.

Over time, OnePlus progressively expanded its device catalog: wireless headphones, smart TVs, and other smart accessories, paving the way for the introduction of personal wellness products and wearables. The arrival of the OnePlus Watch series symbolizes the next logical step in completing its ecosystem and offering a seamless, connected experience across devices.

The development process has not been without its challenges. The launch of the Watch 3 has been particularly media-focused, not only due to the hype generated but also due to an unexpected setback in its European distribution. A typo on the back of the watch ("Made in China" instead of "Made in China") forced the brand to partially delay the delivery date for new batches, thus demonstrating the level of rigor and commitment to quality that characterizes OnePlus.

The OnePlus Watch 3 boasts a classic, premium design, blending durable materials with modern, elegant lines. The circular stainless steel face is complemented by a titanium bezel that adds both robustness and a refined, sporty look. The screen is protected by sapphire crystal , ensuring superior durability against scratches and impacts common in everyday use.

The watch is available in two main color versions: Emerald Titanium and Obsidian Titanium . Despite its generous size (47 mm), its weight is well-balanced (49,7 grams without the strap and 81 g with the strap), and the ergonomic silicone straps ensure a comfortable fit for various wrist sizes.

The MIL-STD-810H military certification and IP68 protection ensure resistance to shock, dust and water, allowing use in high-impact sports activities, swimming and even short diving sessions (up to 5 atmospheres of pressure).

A key new feature is the rotating crown with haptic feedback . This crown not only simplifies navigation through menus and applications but also improves accessibility for users who prefer physical interaction to a touchscreen. The side button enables quick access to functions such as wallet access, power on/off, and customizable shortcuts.

Personalization is another of its strengths, with easily interchangeable straps and the ability to adapt the screen's aesthetics using customizable watch faces, including the use of short videos as an animated background.

The OnePlus Watch 3 features a 1,5-inch LTPO AMOLED display with a resolution of 466x466 pixels and a peak brightness of 2200 nits. This combination ensures outstanding visibility even in bright sunlight, automatically adapting to ambient lighting conditions thanks to its ambient light sensor.

The sapphire crystal covering the display not only protects against scratches but also enhances image clarity and quality. The reduced bezel allows for a larger active surface area, improving the viewing experience when browsing, checking notifications, and using apps.

The system allows you to activate the "always-on" (AOD) mode, with optimized energy consumption, as well as customize watch faces, facilitating both the display of sports information and quick access to key notifications.

One of the features that most distinguishes the OnePlus Watch 3 from the competition is its dual-processor architecture . This combination integrates:

• El Qualcomm Snapdragon W5 chip, dedicated to the execution of WearOS 5 and all graphical and application tasks, ensuring fluid handling and interaction with Google and third-party apps.
• El BES2800, responsible for the real-time operating system (RTOS) and managing background tasks, optimizing energy efficiency.

This dual architecture allows a smooth transition between "Smart" mode and battery saving modes, preserving autonomy without sacrificing advanced features.

The RAM and storage capacity are designed to support multiple apps, custom watch face downloads, and music storage, providing a seamless experience without space or speed limitations.

Battery life is where the OnePlus Watch 3 clearly surpasses most current premium smartwatches. Thanks to a 631 mAh battery with silicon-carbon technology, the device achieves the following, depending on usage:

• Up to 5 days in smart mode, with normal use, active notifications and daily physical activity monitoring.
• Up to 3 days under intensive use, employing continuous heart and blood oxygen monitoring, GPS, and advanced sleep functions.
• Up to 16 days in energy saving mode, disabling some secondary functions and prioritizing the time between charges.

In comparison, its direct rivals like the Galaxy Watch, Pixel Watch, or Apple Watch barely last between a day and a half and three days in real-world conditions. For more details on features, check out the .

Fast charging is another differentiating factor: just 10 minutes of charging provides enough energy for a full day of use, and a full charge takes only an hour thanks to the magnetic charger with pins and USB output.

The OnePlus Watch 3 runs Wear OS 5 , integrating the latest Google technology and providing full access to the Google Play Store. This allows you to install apps like WhatsApp, Google Maps, Google Wallet, Spotify, YouTube Music , and much more, making it a versatile watch suitable for athletes, professionals, and users looking for a daily management tool.

The Wear OS operating system guarantees regular updates and a growing library of watch faces, widgets, and connectivity with other OnePlus devices (smartphones, TVs, headphones). It also integrates with voice assistants and payment systems, making the watch a natural extension of your phone.

The BES2800's power-saving mode allows users to continue receiving key notifications and basic monitoring without losing connectivity, even with reduced smart features.

The OnePlus Watch 3 establishes itself as a benchmark in health and fitness monitoring , offering a wide range of sensors and AI-powered features:

• Health check in 60 seconds: An exclusive feature that, in less than a minute, analyzes several key parameters to give you a complete view of your physical condition. It includes ECG (electrocardiogram) readings, vascular health, arterial stiffness, heart rate, blood oxygen levels, and body temperature. The European version adds improvements to the vascular health check, which is especially important for preventing cardiovascular risks.
• Advanced sleep monitoring: Analyzes sleep quality, detects light, deep, and REM sleep phases, as well as micro-awakenings and potential respiratory risks. The system uses advanced algorithms to provide personalized recommendations and correlate trends with daily activity data.
• Blood oxygen measurement (SpO2): Allows continuous monitoring, especially useful at night or during intense workouts.
• Body temperature record: Able to detect subtle variations even during sleep, which is key for early detection of diseases or for athletes monitoring recovery.
• Real-time heart rate monitoring: The new sensors offer accuracy close to that of chest strap monitors (Polar H10), making them ideal for both advanced training and general well-being.
• 360 Body and Mind Function: Tools for analyzing emotional state and personalized attention for the user through metrics on stress, energy, and recovery.

The watch automatically recognizes the start of physical activity and the type of sport. It includes over 100 predefined sport modes, from running, swimming, and cycling to racquet sports, HIIT, and yoga, as well as advanced modes for skiing and other racquet sports.

The dual GPS system (L1+L5) provides maximum precision on routes and outdoor training, rivaling professional models in positioning reliability.

In everyday use, the OnePlus Watch 3 stands out for its smooth user experience , thanks to the combination of a touchscreen, physical crown, and customizable buttons. Transitions and animations are responsive, access to notifications is immediate, and it allows you to answer or initiate calls directly from the watch (via Bluetooth), as well as control music and manage notifications from popular apps.

The device is compatible with Android smartphones, and while iOS integration is limited compared to models like the Apple Watch, it still allows for basic syncing and use of certain key features.

OnePlus has guaranteed system updates and security patches, although it limits the promise to two major OS updates, which is about average for the industry.

The watch supports synchronization with third-party fitness and health platforms, and its internal storage allows you to store music for offline playback, ideal for training without relying on your phone.

The OnePlus Watch 3 is now available in Spain and other international markets, with a range of official accessories including interchangeable straps in both colors (approximate price €34,99) and the magnetic charging base (€29,99).

During the launch period, the brand has launched several exclusive promotions , such as:

• Direct discounts of up to €50 on watch purchases from the official website.
• Gifts such as OnePlus Nord Buds 3 Pro headphones (valued at €79) or additional accessories, subject to availability and while supplies last.
• Additional discounts for renewing an old device (€30 off) and special offers on bundles with other brand products (tablets, earbuds, etc.).
• 10% extra student discount, applicable on the OnePlus Education platform.

Offers are often subject to limited availability or time limits, so it's recommended to check the official website for the most up-to-date conditions.

The high-end smartwatch market is increasingly competitive. The OnePlus Watch 3 primarily competes with the following models:

1. Samsung Galaxy Watch Ultra and Galaxy Watch 6 Classic
   Advantages of the OnePlus: Longer battery life (3-5 days vs. 1,5-2 days), brighter display (2200 nits vs. lower ranges), physical rotating crown, and better integration of vascular health sensors.
   Samsung Advantages: Superior integration with Samsung phones, exclusive features like advanced gesture control and a more precise rotating bezel.
2. Apple Watch Ultra 2 and Watch 10
   Advantages of the OnePlus: Much higher autonomy, a more competitive price, Android compatibility, and premium materials.
   Apple Advantages: A closed and fluid ecosystem, increased third-party support for health apps, and improved integration with iOS and native accessories.
3. Google PixelWatch 3
   Advantages of the OnePlus: Better battery, wider variety of natively supported sports, higher-end materials.
   Pixel Watch Advantages: Guaranteed updates for years to come and priority access to new features in the Google ecosystem.
4. Xiaomi Watch 2, Watch 2 Pro and Watch S4
   Advantages of the OnePlus: Higher quality finishes, more advanced precision sensors, and more refined Wear OS 5 software.
   Xiaomi Advantages: Lower prices for entry-level models, expanded compatibility with Chinese apps, and similar battery life in power-saving mode.
5. Huawei Watch D2
   Advantages of the OnePlus: Full access to Google Play, ECG and health features built right into Wear OS software.
   Huawei Advantages: Blood pressure measurement using an inflatable cuff (unique in the European market), improved battery life in limited modes, and true multiplatform compatibility.

Overall, the dual-processor, benchmark battery life, high-precision sensors, and robust design make it one of the most balanced and recommendable smartwatches of the 2025 generation.

The international launch of the OnePlus Watch 3 made headlines not only for its technical specifications, but also for a curious typo on the back label. Instead of "Made in China," the first batch of devices displayed "Made in China," a mistake detected both on the official website and on physical devices.

This setback forced OnePlus to pause distribution in European countries, generating a media stir and jokes on social media. The brand reacted effectively, reporting the incident, rectifying new batches, and compensating customers with discounts and gifts.

Far from damaging OnePlus' reputation, this episode has been perceived as a demonstration of transparency and attention to detail, reaffirming the brand's commitment to quality and user satisfaction.

According to the latest official information and reliable leaks, OnePlus plans to expand the Watch range with new, smaller models and versions with LTE connectivity outside of China, with a planned launch throughout the current generation.

The company also continues to work on improving its proprietary software and integrating with future versions of Wear OS. New health features, fitness metrics, and exclusive watch faces are expected to arrive via updates in the coming months.

Additionally, OnePlus continues to strengthen its ecosystem with official accessories, as well as collaborations with fitness and health platforms, ensuring compatibility with the leading fitness tracking and training apps on the global market.

Reviews from specialized media outlets agree in highlighting the dramatic improvement in battery life and OnePlus's efforts to differentiate itself through premium materials, advanced sensors, and customization options.

• Battery and performanceThe main selling point is its battery life, which is clearly superior to most Wear OS smartwatches. Daily performance is smooth, with no lag or unexpected shutdowns, and the multitasking experience is satisfactory.
• Sensors and precisionExperts highlight the accuracy of the heart rate, SpO2, and sleep sensors, comparable to medical devices and specialized chest straps.
• Design: The consensus is that this is one of the most premium-looking watches in its price range, with a robust and elegant feel, standing up well to sporting and intensive use.
• price and valueAt under €350, the OnePlus Watch 3 competes directly with high-end models by offering advanced health features, full Wear OS, and luxury materials at a reasonable price.
• LimitationsAmong the areas for improvement are the lack of smaller versions for now and the lack of eSIM/4G support outside of China, although this is expected to be resolved in future iterations.

Is the OnePlus Watch 3 compatible with iOS?

It can be paired with Apple devices, although the experience is more limited than on Android. It allows for notifications and essential functions, but access to some apps and customization is limited.

Is the watch waterproof and suitable for water sports?

Yes, it is IP68 certified and 5ATM resistant, allowing for swimming, showering, and light diving sessions.

What's included in the OnePlus Watch 3 box?

Includes the watch, a silicone strap, a magnetic charging station (USB adapter may be sold separately), and basic documentation.

Is the operating system updated?

OnePlus promises at least two major system updates and regular patches, putting it on par with most Android smartwatches on the market.

Can calls and messages be answered?

Yes, via Bluetooth and Wear OS, supporting both calls and quick replies and messaging notifications.

Before deciding on the OnePlus Watch 3, consider these factors:

• Compatibility: The watch is most effective with Android smartphones, especially OnePlus, but is partially compatible with iOS.
• Expected use: If you're looking for maximum battery life, access to advanced health apps, reliable sports tracking, and premium materials, this watch is one of the best options for 2025.
• Size peculiarities: The only model available is 47 mm, ideal for medium to large wrists. If you prefer more discreet watches, we recommend waiting for future versions.
• Launch offers: Take advantage of discounts and freebies on the official OnePlus website and compare them with promotions from approved retailers.
• Future updates: If LTE connectivity and more compact versions are a must for you, check out the brand's roadmap for upcoming releases.