Introduction
The battery is held down with adhesive and is soldered into the motherboard, so it will be hard to remove. Switching steps 3 & 4 may make the repair easier for some.Take your time with this repair and prepare to be frustrated.
Tools
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            Use a Heat Gun to loosen the adhesive under the backing of the device. 
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            Use prying tools to lift up the back of the device to get underneath. 
 
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            Unlock all of the ribbons that cross or interfere with the battery. 
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            Remove the unlocked ribbons if you can- this will make it easier to work with the battery later. 
 
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            Use plastic prying tools to peel up the battery. Metal prying tools may puncture the battery and cause more damage. If you MUST use metal prying tools, go slow. 
 
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            Desolder battery and wires from Motherboard HERE! 
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            Once the wires are free, so is the battery. You should be able to replace the battery and its wires in full (as a package deal). 
 
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To reassemble your device, follow these instructions in reverse order.