Like the earlier versions of the iPhone, the iPhone 4 battery will gradually hold less and less charge as the total number of charge cycles build up. If you find that your iPhone 4 is not holding its charge, then it is worthwhile replacing it, especially considering that it is a very simple process. Unlike the earlier versions, to replace the battery on the iPhone 4 you only need to undo three screws. The entire process of replacing the iPhone 4 Battery can be completed in just a few minutes. There are a number of other reasons why you may need to replace your iPhone 4 battery as well. Damaging the ribbon cable on the battery while performing another repair is another very common cause of the iPhone 4 not turning on. Also if you have tried to remove the iPhone 4 battery and bent it while removing you may have damaged the battery structure, leading to a dead iPhone 4 battery or reduced ability to hold charge.
More symptoms indicating that your iPhone 4 battery needs replacement include:
1. The iPhone 4 not turning on without the charge cable attached.
2. The iPhone 4 boots to the apple logo with the charge cable attached, but then logo flashes several times.
3. The iPhone 4 turns itself off randomly. This can be damage to the small controller ic on the battery, but it can also be a problem with the iPhone 4 logic board.
4. The iPhone 4 back becomes very hot while in use or while charging.
If you are having any of these problems, grab an iPhone 4 Battery Replacement with the iPhone 4 Opening Toolkit included, which comes with everything you need to open your iPhone 4.
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