A new player in the Wear OS field, the OnePlus Watch 2 packs dual-OS and boasts impressive battery life. But can the new device contend with the market’s current leaders? Find out in this OnePlus Watch 2 review.

I am always stoked to see a new challenger enter the scene. Competition breeds innovation, so I love that the OnePlus Watch 2 runs the latest Google Wear OS 4 right out of the box. The device lands with its best foot forward. Historically, Wear OS rollouts have been nothing short of a colossal mess, with some devices waiting more than a year for promised updates. The most assured way to see lines like the Galaxy Watch and Pixel Watch keep pushing the envelope is for other brands to throw their hats into the Wear OS arena.

Beyond its market impact, Wear OS on the new device is a major upgrade to the user experience, especially compared to the previous generation. The underbaked OnePlus Watch offered users a fitness tracking toolkit but very little in the way of smart tools. Thanks to Wear OS, the newest generation packs all the best of Google, including Wallet, Maps, Calendar, and Gmail, plus the Google Play Store for tapping into third-party offerings. It also introduces a voice assistant for the first time, with Google Assistant ready at the tap of a button. These tools make the accessory significantly more well-rounded and wedge the company firmly into the smartwatch conversation.

In short, it’s an excellent example of a Wear OS watch. Scrolling tiles, opening apps, and activating Google Assistant all respond as expected. However, Wear OS isn’t the only operating system on board the OnePlus Watch 2. The device actually packs two chipsets, the Snap W5 gen 1 running Wear OS 4, and a second “efficiency chipset,” BES2700, running RTOS, which handles background activity and a few other tasks like calls and notifications. This dual-architecture, hybrid-systems design is a showstopping way for OnePlus to enter the Wear OS family. The result is a dynamic user experience with distinctive battery-saving capabilities.

In my humble opinion, battery life is where the OnePlus Watch 2 shines brightest. Thanks to its double agent status with two operating systems, it can be used in two unique modes: Smart mode or Battery Saver. In Smart mode, users can access the device’s full capabilities, including all Google apps and Wear OS features. The company claims up to 100 hours of battery life in this mode or up to 48 hours with heavy use. During this review, the watch lasted about 53 hours on a single charge with always-on display and advanced health features enabled, three hours of GPS-tracked workouts, three indoor workouts, two nights of sleep tracking, and regular notifications/usage. This is significantly better than the battery life of the Google Pixel Watch 2 and even slightly outperforms Samsung’s Galaxy Watch 5 Pro, the company’s top offering for battery life. Granted, the OnePlus Watch 2 packs a truly massive 500mAh cell.

When the watch hits 10% battery life, it automatically drops into Battery Saver mode. Here, Wear OS essentially disappears, leaving users with a bare-bones device. Google and third-party apps are inaccessible, as are non-native watch faces, and the always-on display is no longer an option. You can still use most health and fitness functions. However, you’ll only find access to eleven of the hundred-plus workout types present in Smart mode. You can also still receive most notifications and use staple tools like alarms and timers, but essentially, your experience is considerably pared down for the battery savings. The payoff is up to 12 days of use between charges, an impressive spec on a smartwatch.

When it was time to top up, the OnePlus Watch 2 continued to show off with fast charging capabilities that pleasantly surprised me. I wish the watch would lay flat while charging rather than flopping over, but luckily the magnetic pins are strong enough to maintain a connection. Charging the device from 0 to 100% took just over 50 minutes. In 15 minutes, it went from zero to 36%; plenty of power for sleep tracking. A solid 30 minutes on the charger took the watch from 0 to 76%, and after 45 minutes, it was already at 97%.

In light of how long the watch lasts on each charge, this speed makes the device a very convenient daily-use companion. At no point during the review was I caught unprepared with a nearly drained device, which typically happens when using a new wearable excessively to try out features.

To be clear, there were plenty of features to test. The watch offers nearly all the basic tools shoppers have come to expect on a smartwatch, including everything brought to the experience via Wear OS and a wide range of health and fitness tools. The watch boasts over 100 activity modes and even provides professional stats for the most popular sports, such as running. Some workout screens are customizable so users can keep priority data at a glance as they train. For example, runners can view everything from vertical oscillation to ground contact time. Personally, I am a complete sucker for color-coded heart rate zones, a growing trend on many wearables. On this device, these zones are displayed along the rim of each workout screen so I can watch my heart rate elevate alarmingly fast on hills that are entirely too small and on runs that are entirely too slow. Motivation.

I don’t expect any brand to quietly arrive at the Wear OS party. It takes a statement to get a second look from Samsung loyalists or to compete with the pure experience found on the Pixel Watch 2. However, dropping a device with the sheer size of the OnePlus Watch 2 is not the statement to make. A whopping 47mm, the watch is only available in a single bloated case size. I know I have scraggly arms, but these limbs have worn the hulking Apple Watch Ultra without hesitation and rocked a beefy Galaxy Watch 5 Pro without fear.

The OnePlus 2 feels big, looks big, and doesn’t even utilize the space well. Because of its oversized bezels, the actual display is only 1.46 inches, smaller than both models of the Galaxy Watch 6 series. It also shares the Galaxy Watch 5 Pro’s unfortunate lug design, leaving my wrist with a gaping hole between my skin and the band. According to the company, the design is inspired by luxury cars, which I can only assume is their justification for the bulbous, asymmetrical side with the straight edge. To me, it’s giving “high-end stopwatch” vibes, reminiscent of the one my high school coach used to wave in our faces when our mile times weren’t up to snuff. But maybe I just don’t understand the glamour of expensive automobiles.

What is truly unforgivable (and cannot possibly be dismissed as subjective) is the non-functional rotating crown. I had read about this decision prior to actually getting my hands on the device, and I have to say, it’s even more annoying than I anticipated. To be clear, the dial does, in fact, spin, but the action amounts to nothing. It can only be used as a button (albeit a pretty one). I’m sure you’d get used to it, but coming from an Apple Watch and months after the launch of the Galaxy Watch 6 Classic, I try to use its nonexistent functionality at least ten times a day. I also don’t love the hard-angle placement of the second button, but I could definitely be getting picky at this point.

The good news is that both buttons are customizable, so you can set short and long presses to complete actions that make the most sense for your personal use. For example, by default, the bottom button opens the workout app, which may not be a priority for all users. The watch’s control panel, accessed by swiping down from the watch face, is not customizable.

Unfortunately, the design flaws don’t stop at the watch itself, as the OHealth app also leaves a bit to be desired. Unlike Apple, Google, and Samsung, each of which has separate apps for setting up your device and checking wellness stat, the OHealth app is a one-stop shop. From here, users can review their health and fitness data, track a walk or run, or access the settings menu for their devices. Unfortunately, the app is simply too minimalist.

On the settings front, its most prominent function is managing your watch faces, and there frankly isn’t enough variety in the native option library. Most echo the sporty grandeur assigned to the watch’s overall aesthetic. If you want something especially playful, or a sleek, traditional analog face you’ll need to shop available Wear OS watch faces in the Google Play Store.

On the health side of the app, it is missing industry-level details and lacks depth or actionable insights. This would be less distressing if the stats you do find were consistently accurate. Throughout this review, I ran into numerous discrepancies compared to other wearables. Starting with the most basic, my step counts were markedly different than every other device I tested against. Likewise, the watch measured my sleep as an average of 25 minutes longer than my Oura Ring 3, a reliable overnight tracker. Notably, another AA reviewer had more reliable sleep results on their unit, but it could be that they don’t wake up as often throughout the night.

Though my resting heart rate aligned with my chest strap, it was less accurate during workouts, most often measuring ten or so beats higher. It also failed to keep up with sudden spikes during interval training. Again, an AA colleague also tested heart rate on his own unit and actually found his heart rate inaccurate in the opposite direction; it was much lower than his Apply Watch Ultra. Either way, it’s not reliable data. My hope is that this is an algorithm issue rather than a sensor one and can be remedied via software updates. Unfortunately, the watch does not feature a temperature sensor, so women’s cycle insights are unavailable. It does pack an SpO2 sensor, which measured in line with my Apple Watch Ultra 2.

In short, the watch has potential on the health and fitness front, but it needs improvement. This also applies to workout tracking. While it’s great in theory to see tons of sport modes to choose from when training, the platform is underdeveloped, and I question whether the watch is really capable of measuring such variety. It failed to recognize a number of workouts that should have been auto-detected, and for the few walks it did recognize, it started noticeably later compared to auto-detection on the Galaxy Watch 6.

Even the dual-frequency GPS, a highlight of the device’s launch, proved finicky. After runs and walks, only a few of my total distances were within a reasonable distance of my Apple Watch Ultra 2, a device with a notably accurate sensor. As you can see on the map above, the OnePlus watch also recorded me in neighbors’ houses and yards. Other times, my route appeared on the wrong side of the road, and, at stretches, recorded me running right up the middle of the road like a daredevil (which I am not). This is a disappointing result for a headlining feature.

On a related note, the Wear OS platform in general remains a tangled mess in terms of data sharing. Via Health Connect, some of my data would sync to Google Fit, but not all. From there, some of my data would sync to Strava, but again, not all. Between bugs and convolution, it’s a pain to export data from this watch. This might not be an issue for the average user, but it’s a nuisance for reviewers and serious athletes.

Users from the Android ecosystem typically start their shopping within the Wear OS family. The OnePlus Watch 2 earns its place there (alongside Samsung and Google) with the latest software available. It packs the best of Google’s toolkit and all the smart features you’ll likely need. Meanwhile, it makes a strong bid among the more established brands with fantastic battery life. The OnePlus Watch 2 knocks other brands’ offerings out of the park, especially the Pixel Watch 2 ($349.99 at Amazon). Thanks to its unique dual-architecture and fast charging capabilities, the device offers a stress-free user experience for multi-day wear, and is generally a massive improvement over the original OnePlus Watch.

Yet, the current market is tough, and this device isn’t perfect. It doesn’t offer any flexibility in size and it’s likely too big for some wrists. Anyone hoping for variety should head to the Samsung Galaxy Watch 6 ($299.99 at Samsung) or Galaxy Watch 6 Classic ($429 at Amazon). If you’re a Samsung phone user, you should be looking that way anyway due to all the exclusive features and interoperability.

It also doesn’t offer top-of-the-line fitness tracking. Shoppers who want truly reliable GPS and heart rate data plus tons of advanced training tools should check out the Garmin Venu 3 ($449.99 at Amazon). It may be more limited on smart features, but it’s a well-rounded device overall.

Finally, the OnePlus Watch 2 is incompatible with iOS. As usual, I recommend the Apple Watch Series 9 ($392.67 at Amazon) for most Apple phone users, or the Ultra 2 ($679 at eBay) if you have money to burn.