If the battery is original to this 4-year old system, it likely needs to be replaced.  Batteries do not last the life of the system.

https://www.parts-people.com/index.php?action=category&id=143&subid=1201&refine=battery

It maintains charge just fine when switched on. My issue is why is it draining at all when shut down?

It charges when switched on which would indicate to me that it's not an issue with the battery.

Most of the time, when a battery is end of life it will charge, but discharges quickly.  You can determine the charge capacity of the battery by running powercfg /batteryreport at a command line with administrative privilege.  If you see an appreciable difference between the design and current charge capacities, it's time for a new battery.

Are there any USB connections to the system when it is shut down?  The battery is live at all times and some power will be drawn to keep the CMOS contents, but anything else connected can also draw power even when the system is shut down.

I'm having the same exact problem my battery is draining when shut down but it also drains very fast when im using it and it's not on a charger, will replacing the battery be the solution I have been using this laptop since 2019 so it is 3 years old?

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I have a third party USB C adapter (Hyper Drive - 3xUSB 3, LAN, HDMI), and whenever connected my laptop goes to sleep only once in 5 times, and when it does it takes a long time for fans and keyboard light to turn off.

Even in cases when not having ANYTHING plugged in, the laptop often wakes up from sleep for no reason. When I check powercfg /sleepstudy it says the reason for waking up is keyboard input. But the laptop is sitting with closed lid, nothing is touching it. Something isn't right. (Btw, I checked powercfg -a, and the laptop is in "disconnected standby mode".)

The laptop simply does NOT sleep properly, and MANY people have this problem. I can't just close the lid when I'm done with work, I have to use hibernate. And then wait 20 sec for the laptop to wake up the next time.

Same problem here. I never leave comments but this made me create an account just to say that I feel you, bro. I am never buying Dell again. This and all new Windows 11 nonsense is filling my rage and I am starting to think about switching to apple. And I was always an apple hater!

Oh... and I should also mention that my laptop gets so hot (another well know problem with these machines apparently) that one day I left it switched on and closed for a couple of hours, the heat has burned a slight ghost image of the keyboard onto the screen??? Its not massively noticable but still.... should this really happen to anything you pay so much for? If I provided a customer at my job with such a poor quality product I would be swiftly shown the exit, even if the issues showed up 1 year after purchase.

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