Dell laptop battery drains quickly even when shut down

Hi everyone,

I have a Dell Inspiron laptop and recently noticed that the battery keeps draining even when the laptop is completely shut down. For example, if I leave it at 100% and check it the next morning, it drops by around 10–15%.

Things I already tried:

• Updated BIOS and drivers from Dell Support

• Disabled Fast Start-up in Windows

• Checked background apps (nothing unusual)

Still facing the issue. Is this related to BIOS settings like USB power sharing, or could it be a hardware fault?

Any suggestions would be appreciated.