If you've bought a Windows 10 laptop in the last 18 months you'll know they they almost always come pre-configured with Windows 10 battery saving set to maximum, what this means in practice is that your battery will never charge more than 80% while Windows is running. You can switch it off, but Windows 10 does not make that easy putting a bunch of barriers to deter you in the way.
It's about extending the longevity of the battery for many years, at the expensive of the battery life for any session. In laptops with easily replaceable batteries, where new battery around grind £60-70 quid, many people just disable it. It's of little benefit for my battery to last an extra couple of years if I can't get through the day on a full (80%) charge.
My ASUS Zephyrus was configured this way and this has an easy too service battery.