Answer to "iPhone battery not charging after DIY battery replacement. Why?"I had the same issue, I replace the battery wouldn't charge more than 40% and after a few hours would only be at 6% so I put the old battery again to make sure I didn't brake anything on the phone and sure enough it took the charge all the way to 100% again so is not the phone,is the cheap Chinese battery! yeah it was cheap but I just lost $14 dlls on another Chinese scam shame on me! might as well go to a dollar store and buy it from them! GOOD LUCK FINDING A GOOD BATTERY ON LINE! ALL OF THEM ARE CRAP!