Saltank, thanks to your comment I didn't overtighten those little screws! I would try to get a better quality driver from a local hardware store to see that helps, the one ifixit sent are not very good quality. If that doesn't work, you may have stripped the screws.

I just changed out the battery on my Iphone 5 with a ifixit battery and my phone keeps rebooting every 3-4 minutes!! Its showing that the current battery only had a 18% charge. When plugged in it seems to be charging but I'm not sure because of the restart problem! Has anyone else had this issue?

ANother thing, right before it turns off the screen fades a blue-green color and distorts the screen. Then i see the apple logo. I was very careful installing the battery, didn't have any issues except that when attempting to remove the front screen with the suction cup, the screen came off very fast...but i was still holding everything close and no damage could be seen on the ribbons towards the top of the screen. Please help!!