Pixel Watch 4 Leak Reveals Big Battery Boost, New Sensors, and Unique Charging Design

The Pixel Watch 4 is expected to debut alongside the Pixel 10 series and Pixel Buds 2a on Wednesday, August 20. Google has only confirmed the event date — not the specific devices — but a fresh leak strongly suggests the smartwatch is on the launch list, and it comes with some intriguing upgrades.
Images posted to Reddit, reportedly official marketing slides, reveal that the Pixel Watch 4 will feature improved durability, longer battery life, and more accurate activity tracking thanks to a new “Gen 3 sensor hub.” This hardware upgrade should mean better precision for heart rate monitoring and other fitness metrics, although the real-world improvements won’t be confirmed until hands-on testing is possible.
A Fresh Take on Charging
One of the more unusual elements highlighted in the leak is the side-mounted charging system. Unlike most smartwatches that charge from the back, the Pixel Watch 4 appears to use contact points positioned along the side of the casing. This design showed up in earlier leaks and could set the watch apart — though it raises questions about compatibility with existing accessories.
Promises of “Technological Advancements”
The leaked slides lean heavily into the marketing language, promising “significant technological advancements” and a “premium crafted design.” Battery life is a headline feature: the watch is said to last up to 30 hours on a single charge — roughly a 25% improvement over the Pixel Watch 3 launched in August 2024.
Two size options are listed — 41mm and 42mm — and the watch is expected to include Gemini integration as well as dual-frequency GPS for faster and more accurate location tracking.
What This Means for Google’s Wearable Strategy
If these details hold true, the Pixel Watch 4 is shaping up to be a meaningful upgrade rather than a minor refresh. Better sensors, smarter GPS, and a noticeable battery improvement address some of the biggest criticisms of earlier models. The unique charging method may take some getting used to, but it could also hint at broader changes in Google’s wearable ecosystem.
With the launch event just days away, the Pixel Watch 4 could easily earn a place on the list of best smartwatches if it delivers on these promises. Until then, this leak gives us plenty to be excited about.