The non-touch version of the Dell XPS 13 lasted for a very strong 11 hours and 54 minutes on the Laptop Battery Test, which involves continuous surfing over Wi-Fi at 100 nits of brightness. However, when you use the laptop, its endurance will vary, based on the screen brightness, the workload and your configuration (the 4K screen gets much lower battery life). Here are some tips to increase your XPS 13’s battery life.
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https://www.laptopmag.com/articles/increase-battery-life-dell-xps-13