draining quicky at first later he also received a red screen
I have the same issue with an iphone 6. My customer reports that his iphone was draining quicky at first later he also received a red screen which he fixed a few times by pressing the home and power button. Then at the end he got the message that he used an non official charging cable and then his Iphone just diede.
I replaced both battery and dock connector without any luck :(.