Best answer: There are two different batteries available with the Dell Inspiron 15 7000 based on what type of display you choose. The FHD display comes with a three-cell 42Wh battery that should realistically last between five and seven hours of regular usage, while the four-cell 56Wh battery with the 4K display should realistically last about three to five hours of regular usage.
Dell: Inspiron 15 7000 (7570) (From $800)
What affects battery life?
Like most Dell laptops, there are different configurations available for the Inspiron 15 7570. They range from 8th Gen Intel Core i5-8250U processor (CPU) models with no discrete graphics (GPU) and a 15.6-inch FHD display (touch also available), up to Intel Core i7-8550U CPU models with an NVIDIA MX130 discrete GPU and 15.6-inch 4K touch display. Both CPUs have a 15W thermal design point (TDP), meaning they'll both suck up about the same average amount of power. Where battery life really differs is in the GPU and display choice.
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