Iphone 4 will not turn on after dying?

I recently got a used iphone 4 and it already has a battery drain issue that is yet to be fixed but my phone died earlier today and has been dead all day. After a while the dead batter screen (the one showing the red batter) saying you need to charge stopped showing up too. No matter how much i press the power button it doesn't turn on i put it on the charger for like an hour and nothing showed up. I don't know what's wrong but i really need an answer because its very frustrating. I tried the reset thing it the home and power button nothing works. I don't have a warranty because its a used apple iphone 4g 32 gig unlocked.

Get a new cable or replace the battery it's really easy it only involves 3 screws

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