iResQ provides an iPhone 4 self-install battery kit. This includes the battery, one pentalobe screwdriver (for removing the back glass) and one philips screwdriver to remove the old battery.
Installing the new battery is easy and can be done in just a few minutes.
Your iPhone may have the newer "Pentalobe" screws installed on your phone . If this is the case, you will need to use this screw driver which is specifically designed to work with the newer, pentalobular (5-point) screws.
To verify which screws that you have installed on your iPhone 4/iPhone 4S, refer to the image below. If the screws are normal philips screws, then all you will need is a #00 Philips Screw Driver. If you find that the screws are pentalobular, you will need this screw driver to open your iPhone 4/iPhone 4S.
Click image to enlarge:
iResQ 90 day Warranty
30 Days for Refund
Product SKU: IPH4BATSK