I'm so serious. This is not a joke. 

So on Tuesday night I left my phone 1% without charging. When I opened on Wednesday, it's still 1% so I thought it was ok. I mean, it still works and has a bit power. I charged it. 

I charged it for 3h straight and it's still 1%. I got frustrated because why iPhone why? I tried to charge it for oh so long but it still didn't work. Today it's still the same. Even though it's 100% but I can't use it without charging. I must charge it while using. Now I'm charging. 

So anyone, do you know why? And can you give me advice on how to make it work properly again? Because I can't ㅠㅡㅠ 

Oh I forget, I change it since last week. My iPhone 5G is given to my brother. I change into iPhone 6Plus. 

Help please help ㅠㅡㅠ I don't understand!!!