Why does Battery Optimizer tell me that I have a different amount of time left on my battery than what Windows tells me?

The time left at current charge figure that you see on most laptops (some do not have these figures at all) are designed to not fluctuate too much even when you computer is under heavy load. Battery Optimizer tells you in real time how many minutes of battery life you have at your current discharge rate at that point in time meaning that at any period of time the Battery Optimizer’s reported time left at current charge may be different than what Windows tells you.