OnePlus quietly pushed a Wear OS 5 update to the Watch 2 — and it’s causing major battery drain

OnePlus released its Wear OS 5 update to certain OnePlus Watch 2 and 2R customers on December 29, slipping past its self-imposed end-of-year deadline, much like a college student faxing their assignment to the professor at 11:59 p.m. This last-minute update has caused issues ever since, as you could anticipate.

Wear OS 5 was originally scheduled to be released between July and September 2025 for the OnePlus Watch 2 and Watch 2R, which were both released in 2024 running Wear OS 4. The company merely stated that the upgrade would arrive “in the near future” after Android Authority inquired about the delay in October.

Some owners of OnePlus Watches have now received the update, but not all of them; my OnePlus Watch 2R, which is located in the United States, still displays the May 2025 security update and Wear OS 4. But considering the impact of the update, this could be a blessing in disguise.

The upgrade is seriously depleting the battery, according to this Reddit thread and other OnePlus forum postings. Before the upgrade, the Watch 2 and 2R often lasted three days in smart mode; however, some customers claim that even after attempting factory resets and other solutions, it won’t last a full day.One user states, “I’m completely heartbroken and frustrated with the severe battery drain issue impacting my OnePlus Watch 2 with the Wear OS 5 update.” “On light usage, my OnePlus Watch 2 now drops from full battery at 1:00 PM to a crucial 10% by 11:00 PM.”

Another customer comments, “I used to get 2.5 days easily with most settings on (at least 2 days)… Now I hardly get 1 day.” In response, someone said that while his drain wasn’t quite as bad, it was now “a strict 2 days” instead of the previous 3–4 days.

Many customers identify particular apps—such as the Weather app, Play Store, or “Wear OS” itself—as the source of the drain, but the diversity indicates that this is a system-wide problem rather than a single app.

The fact that stock Wear OS 5 is (A) a very modest upgrade with few notable changes and (B) meant to make Wear OS work more efficiently, as it did on Pixel and Galaxy Watches, is what makes this update particularly annoying to users. This unoptimized upgrade for last-generation phones is frustrating because the OnePlus Watch 3 has been running this version since April without any problems.

Any company can release a flawed update, but I would have expected OnePlus to either pull it back or provide an update schedule after two weeks. Instead, based from what we’ve seen, OnePlus hasn’t made any formal announcements. A few days ago, my colleague contacted OnePlus on the update, but we haven’t heard anything yet.

This upgrade greatly worries me because I have suggested the OnePlus Watch 2R as my top choice for an inexpensive Android smartwatch, mostly due to its long battery life. OnePlus must demonstrate that it will appropriately support these watches and that its pledge of two Wear OS updates and three years of security updates is more than just platitudes.

As it stands, the new OnePlus Watch Lite used a proprietary RTOS similar to the previous OnePlus Watch, completely eschewing Wear OS.