Battery Issues

My apologies if this has been discussed, but I wasn’t able to find it with a search.

I’m running on an HP Pavilion laptop, and when I boot, or try to boot, the laptop battery is almost always fully depleted or nearly depleted. It charges fine when plugged in, and once charged, does not appear to rapidly deplete while unplugged and in use, but it doesn’t seem to hold a charge from use to use. I never noticed this before installing Qubes in this laptop, and I have not noticed it with an older Thinkpad that I also have had Qubes installed on.

I’m wondering if this possibly has anything to do with the OS or if maybe it’s just a coincidence.

So it’s discharging when it’s shut down?
Are you sure that you’re shutting down the system instead of suspending it?
Maybe the system is not fully shutting down and is still running when you shut it down.