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So one of the main selling points of the laptop I just bought last week (Dell xps 13 9300) was its long battery life, allegedly 8hr on heavy use, or 13 hours light use, according to most benchmarks I saw. However, I realized it really only lasts 3-5 hours, which is not anything more than my 5 year old laptop.

I'm including here a screenshot battery report I just generated directly from windows.. Here is the full report if it helps, in PDF.

I was wondering if this is normal. The specs are 16gb ram, i7 1065G, FHD NOT 4k Touch screen. I swapped the 256 NVMe SSD for my 512GB SATA SSD. I have it on dual boot with windows + an ubuntu/debian distro. Windows version is 10.0.19041, build 19041.

The only non-faulty reason I see for this would be that I swapped my old SSD with the one that came with this laptop without doing a clean install of windows, and even though I installed all the drivers/updated the BIOS maybe not doing the clean install hinders battery optimization?

I did indeed check and all my drivers/bios are up to date.

Laura Salas
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In order to verify that your new computer is operating properly, you need a fresh install of some operating system and measure that way.

You have used an old disk with an old operating system install and it is using 45% CPU which is a lot and which drags down your battery. That is why the battery is depleting quickly.

A properly working machine will normally have an average CPU load of 5% or less more than 95% of the time.

Try a new OS known to be free of problems.