The Dell XPS 16 with Intel's Panther Lake Core Ultra 325 chip and an LG Display 1-120Hz variable refresh rate panel just recorded the best battery life Notebookcheck has ever measured in its Wi-Fi browsing test: nearly 27 hours from a 70 watt-hour battery.
The key number is 1.5 watts at idle. That figure, combined with a display that can drop to 1Hz when static content is on screen, is what separates this result from every prior contender, including Apple Silicon and Qualcomm Snapdragon machines. The 70Wh pack Dell used here is actually smaller than the 99.5Wh cells Dell has shipped in previous XPS configurations, which makes the endurance figure more striking, not less.
The full Notebookcheck review is worth reading for the methodology: how the variable refresh rate interacts with real browsing workloads, where Panther Lake's power envelope sits under sustained load, and whether the efficiency advantage holds when the display is pushed toward 120Hz. The headline result is remarkable. The tradeoffs buried in the data are the actual story.
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