Introduction
Use this guide to replace a worn-out battery on your Evo 4G.
Tools
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            Gently insert an iPod opening tool between the rear panel and the inner rear frame near the headphone jack. 
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            Use your iPod opening tool to pry up the rear case around the perimeter of the Evo. 
 
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            Using the tip of your finger, lift the battery from the end closest to the camera. 
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            Remove the battery from the rear inner frame. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.