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I noticed something, the phone works normally from 100% to 20%, but when the battery level drops below 20% and asks me to activate the battery saver mode, the battery level falls to 10% and then 1% in 2 seconds.

The phone work normally, but I feel the battery is stuck at some levels or drains slowly, I tried to turn on the flashlight and open all apps but the battery decreased by 1% after 5min, which is not normal.

I have a mi9 phone with 12.5.1 Rom, after a year of use, I noticed today a weird problem with the battery, when it gets below 20%, it falls in 1 second to 1%, and then the phone shut down, and when I plug the charger the battery level shows 6% instantly. I tried a factory reset, but the problem...