Lenovo attempted a hybrid battery solution on their T480 laptops 3 years ago. Lenovo had a normal swappable battery AND a built-in battery attached to the motherboard. Unfortunately, now after 3-5 years those built-in batteries have begun to fail.
Now, the laptop still has an external battery that's replaceable so the laptops still have lots of life left in them. But once the onboard battery is detected as 'failed' Lenovo "nagware" is activated reminding you of the fact the onboard has failed - and it does this like every 15 minutes!
In order to stop this annpyance that's ruining a perfectly good laptop experience is actually very easy.
1.) Open Computer Management.
2.) Expand System Devices.
3.) Look for the "Lenovo Power and Battery" device.
4.) Right-click and choosr "Disable device"
That's it. It appears in both lab and production laptops this has resolved the issue. These laptops have NO Vantage or System Update software installed. Rhey are fresh W10-21H2 installs.
Hopefully this helps as I have struggled with this issue for almost a year. If you experience so.ething different or have additional suggestions, comment below.