Introduction
The 11.4V battery powering the hp envy is stored inside the bottom part of your laptop. To access the battery the laptop must be taken apart.
Tools
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            Remove the two no-slip covers on the rear, bottom side using spudger shown in top center of picture. 
 
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            Remove all fourteen 4.5 mm screws from the bottom using a Phillips #0 screwdriver. Each location is marked by a red circle in the picture. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.