Replaced iPhone battery but it won't charge?
I replaced the battery on my iPhone 4S, everything went fine. After replacing the battery I turned the phone on and the battery was already charged to 65%. I read online that you should drain it then charge it so I let it run out of battery and it seemed to last quite a while. After the battery had been completely drained and the phone died I plugged it into the charger. The little symbol of the red battery and the cable was displaying on the screen so I thought it was charging, but after leaving it on charge all day it wouldn't turn on. It was still acting as if it was completely drained - when I tried to turn it on the little symbol with the red battery would pop up indicating that you need to charge it and when I plugged it in same thing the symbol with the cable. I put the old battery back in and it is working fine. I think I bought from a pretty legitimate source because he has thousands of positive feedback on eBay plus the battery actually worked when I first put it in and it didn't just burn out really quickly.
I was looking at the answer linked below to a similar question, where someone says it could be because the battery is completely drained less than 0.5V and he suggests using the positive and negative wires from a PP3 9V battery and connecting them positive to positive and negative to negative on the iPhone battery which is supposed to give it a small charge enough to enable it to use a charger. I don't have a multimeter or any tools to tell which is positive and which is negative so I wonder if just randomly trying will work although I'm not even sure this is my problem since the battery was charged when I put it in I don't see how the phone would let it get below 0.5V.
Is this a good question?