Not sure if this is related, but I have a 2021 Legion 5 Pro, and even fully powered down it seems to lose a lot of battery power overnight. (Maybe 5%-10% charge, IIRC?)

And this is even after changing the BIOS setting so that it's always-on USB port isn't always on.

I'm really curious where the power is going. Or if the supplied battery has internal leakage issues.