Introduction
Make sure to be very careful when handling the battery, lithium batteries are prone to exploding when bent or punctured. If the device is experiencing a short life span or any other issues regarding the battery, follow this guide to replace the battery.
Tools
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            Turn the device screen side down. 
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            Carefully remove the back piece with the iFixit opening tool. 
 
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            Pull the camera plug upward and away from the motherboard with your fingers. 
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            Gently pull the camera from the device. The camera is held by tension. 
 
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            Remove speakers gently using your fingers, they pop out easily. 
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            Disconnect cords attached to the speaker from white pod. 
 
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            Remove the four black 3.32mm screws on the corners of the motherboard using the Phillips #000 screwdriver. The motherboard should come out easily. 
 
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            Pry the battery away from the display screen gently using a nylon spudger or the plastic opening tools. 
 
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To reassemble your device, follow these instructions in reverse order.