Best answer: According to official figures from Dell, the new XPS 15 7590 with a 97Whr battery will last up to 20 hours on a single charge. That's crazy talk because, unfortunately, you'll likely see a few hours short of that claim in real-world usage depending on your laptop configuration and how you use it.

Incredibly efficient computing

Just how long your laptop will last depends on the size of the battery, as well as the power draw of installed components. The new Dell XPS 15 comes rocking two battery capacities: 56Whr and 97Whr, the latter being better overall across all configurations. With the new Dell XPS 15, you're more likely to get near Dell's claim of 20 hours if you opt for the 97Whr battery option with a Full HD display and Intel Core i5 processor, while the optional 4K OLED panel and more power-hungry Core i9 processors will have a negative impact of up-time between charges.

If you primarily use your laptop for intensive system tasks like photo or video editing, this will also deal a severe blow to the estimated time until depletion. Those of you who are a little more light on use when mobile will be able to draw as much as possible from the integrated battery. You should be looking at around 10 hours with the smaller 56Whr battery and approximately 14 hours with the 97Whr power plant, which will be significantly reduced with the 4K displays.

Luckily, the new Dell XPS 15 supports USB charging, as well as the dedicated AC port. This allows you to top-up the laptop when you're running low with a compatible portable power bank.

The latest from Dell

Dell XPS 15 (7590)

The most powerful 15-inch laptop now has 4K OLED

The latest Dell XPS 15 has a new option for a 4K OLED display, NVIDIA GTX 1650, and has the latest Intel Core i9 processor inside. It's a powerful PC from one of Dell's most recognized lines of laptops.

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