Step 1
Before replacing the battery of your iPhone 4, it is necessary for safety reasons to turn it off.
To do this, hold the On / Off button (power button) located in the top of the phone for 6 seconds.
Then, slide your finger to the right on the button "Turn Off" appears in red.
Step 2 - Image 1 - Repairing Battery
Step 2
Unscrew the two screws circled in red located around the charger connector of your iPhone 4.
Depending on the versions of iPhone 4, these screws are either pentalobe formats (proprietary Apple format), or cruciform format.
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