My Iphone 4s keeps breaking its batteries?

Hey so I got this iphone 4s a while back on ebay for a steal of a price, but it had a terrible battery. I replaced it and it worked perfectly. After about a month or two the iphone battery broke again. Now the iphone won't even turn on, it just gives me the please charge symbol. Why does this keep happening? How can I permanently fix it?

Needs a professional repair. Probably got wet at some point and has a short that is draining the battery.

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