Well, basically I bought a good battery it was working fine, and lasting for a long time on a single charge. After like 40-50 cycles or so, I left it without charging and it drained to zero. Now, I can't charge the phone (I use wall charger). It shows only the battery red line sign and a cable, and when I plug it in, it only shows the red lining battery.
I tried keeping it overnight on charging (I use wall charger, because I know it is stronger).
I also tried going into DFU mode, but to no avail. No use. It can actually go to iTunes and iTunes detects the phone, and I can actually restore the phone, but after it finishes it resets and the same happens - red lining battery sign.
I tried keeping the battery on red hot sun and after it almost melts from the heat I wait one minute to cool off and then I put it in phone, same result.
What else can I do?