iPhone 4 Battery Replacement
Well, the process is not nearly as easy as the demo might suggest. Pay attention to the issues around proper screwdriver size as the screws are very easy to strip, especially the battery connection screw. Warming the glue behind the battery with a hairdryer really helped immensely as the battery was then easier to pry up and remove. Because of the short length of the battery connector screw, having a tweezer and magnifying glass helps. If your screwdriver is not not securely slotted into the head of the screw, make sure it is before you try to remove and re-install it. Unless you have patience and read the comments here carefully, your chances of experiencing a glitch are high.