Do you have the battery protection feature on? If you do, that would be why. Batteries that charge to their max and stay plugged in will cause heat to be generated. This heat does damage to the battery, and over time causes more significant degradati...
Put your phone in charging for a night then try turning it on by pressing Power + Volume Down button together.What usually happen with Li-ion batteries that they are not supposed to undercharge. There are circuits for that to prevent your phone from ...