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iPhone 4 Battery - iFixit
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iPhone 4 Battery Replacement - iFixit Repair Guide
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iPhone 4 Repair Help: Learn How to Fix It Yourself.
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How to replace the iPhone 4 battery | iMore
How to Replace iPhone 4 and iPhone 4S Battery: EveryiPhone.com
iPhone Battery and Performance - Apple Support
How and where to replace your old, depleted iPhone battery