My iPhone won't turn back on

Okay. So I got this iPhone, & like just simple stuff was happening. So I looked up on it. & it said that you have to take the back & battery off? So i did that & now it's all back together. But the only way it stays on is when it's connected to the charger. It's says 100%. & only stays on for like 2 minutes, then fully turns off.

You have a bad battery

Sorry nothing can fix that but a specially trained technician sorry but you will have to either buy a new one or send it in for repairs

You have a bad battery.

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