Why isn't my Samsung Galaxy S3 battery charging?

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AC Question

Samsung Galaxy S3 battery not charging

I had a Samsung S3 for over two years now. Recently, the battery started giving me issues. First of all, it would drain from 100 to 0 in less than two hours when I have the screen on (taking pics, browsing, emailing etc.). My internet (4g LTE or wifi) is always on.

Then I ordered a new Samsung battery off Amazon thinking its a battery issue. I tried using a different charger, a different battery, cleaning up the charger hole (thinking there's some lint in there), charging from USB vs. directly from electric outlet. But my S3 now even fails to start up. Even with the new battery, it does not start up.

The phone has not fallen down, or there are no other such issues. Can anyone help?