There really isn't anything to investigate.  Between the CPU, the GPU (which is the biggest power consumer in the system) and the screen (the difference between battery life on FHD vs UHD is more than just "better"), you have a system designed for performance - not battery efficiency.  
Hi, 5 months ago I purchased a Dell XPS 15 9510 laptop. However, I've experienced a very low battery life since the beginning: To be clear: in Windows I'm literally doing NOTHING interactively: no browsing files, no browsing the web, no Office work, no games, no video/audio, no nothing! Not a single front-end application has been opened. I've started measuring after a clean reboot and 5-10 minutes after logging on (only 1 Windows session active). I've disabled the timeouts for the display going black and sleep mode, so the system keeps active (but while doing nothing). I've got the same problem with Windows 10. I've waited a few weeks before contacting support, because I wanted to install and configure everything first, including drivers, firmware, support software, etc. But to no avail. My specs (in a nutshell):Dell XPS 15 9510Gen: 2021Intel Core i7-11800HUHD+ (IPS 3840x2400, 500 nits) (in BIOS Setup: brightness is on 50% by default and I've not changed this)2 TB NVMe SSD32 GB RAMNVIDIA GeForce RTX 3050 TiBelgian Azerty1 year Premium Support with Onsite Service130W adapter Dell has already changed my battery AND my motherboard, but the problem is still here. A support guy told me a much higher battery life should be possible according to tests with a laptop of my particular model in a Dell lab. However, Dell seems to give up and wants to give me a full refund now. There is a possibility that there is a problem with my laptop which is not caused by the battery or the motherboard, but of course the question is: what? And is it true that my particular model should behave much better for battery life? Or is there a structural problem? Will a new attempt to buy the same model (or the same model, but with an OLED screen) give me a good working laptop with much better battery life? Anybody out there with a Dell XPS 15 9510 with somewhat similar specs? Which battery life do you get in BIOS Setup? And in Windows 10/11, while doing nothing (disable display out + sleep though)?I know a lot of you have experienced bad battery life with Dell XPS, but of course I'm especially interested in Dell XPS 15 9510, although other experiences (13 and 17) are also useful! Also, if anyone has an idea what I could do to improve battery life without putting brightness on 10%, then please let me know! Perhaps Dell has an issue with a certain hardware component? Or perhaps a feature like Modern Standby doesn't work well? What times do you guys get? Tips? Advice? Thanks! Padre PedroBelgium
XPS 15 9510, extreme low battery life