Windows 10: Sudden drop in battery capacity history

Hello, why did my battery capacity suddenly drop? My laptop is ASUS X515, bought on April 2021 and the capacity suddenly dropped so much in December and now it's not turning on when unplugged.

:)

 

Sudden battery drop to zero

It's right near the top.




If you had run a battery report when the battery was brand new, you would have seen its Full charge capacity matching its Design capacity. That ratio reduces as the battery gets used. Yours is currently 20034/48944 ≅ 40%

There's no generally-applicable magic number at which the battery is deemed to be too worn out for further use. In your case I think you'd make your decision based on time rather than charge level - it would be when the battery did not last the whole of your journey.

Denis

 

Sudden battery drop to zero

Okay. Since the time I bought this laptop, I had made a setting that windows should remind me whenever there's a 35% battery remaining. Why doesn't it work in these cases?

 

Sudden battery drop to zero

Your battery has dropped in capacity to 40% of the original designed capacity.

The assumption is that it was of very bad quality in the first place.

The apparent drops from ~50% will be due to further deterioration of the capacity after the most recent calibration point.
Hence no warning as this assumes accurate calibration. It would reach zero capacity at some higher percentage which is what you see.

The solution is to get a new quality battery.