fully dead iPad air 2, Battery is a 4V

Hi i saw that my ipad was not turning on after i unplugged it from the charger. I tried to turn it on and there was only a black screen. The iPad was kinda hot in the back of the device but not sign of life. I decided to open it up to see if the battery died and to my surprise the battery is at 4v which should be good for the iPad to turn on. Can anyone help with what the problem is.

Also, i took it apart thinking that is the IC chip and i could just manually charge the iPad.

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