What does it mean if your Windows laptop shows "Consider Changing Your Battery"?

"This is how I check how well a battery is doing

let it discharge completely.
Time how long it takes to charge to
100%.
Remove AC adapter and time how long it takes to deplete if it's dead in less than 35-45 mins. You probably need to replace it. How old is it?"

"I'm assuming this is an older system and the battery has gotten a considerable number of cycles, and a low capacity compared to the design capacity - MS has a writeup on this in their help site

If the battery actually works fine however, this may mean that something is off - some systems apparently misreport their battery capacity, and as such give the warning even when everything is working fine - a bios update may fix this.

There seems to be another fix for it here , tho this seems to be just settings tweaks"