Introduction
After too many charging cycles, the battery's capacity will be decreased. This is true for any Lithium-ion battery. Luckily the replacement of the battery in this device is very simple.
Tools
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            To open up the casing, you will need to unscrew the four Phillips #0 15mm screws which are accessible from the back. 
 
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            Disconnect the battery from the motherboard by lifting up on the white plastic tab on the top of the connection. 
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            Gently pull the cord out by the white plastic adapter. Do not pull from the red and black cord. 
 
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            Slowly pull the motherboard out of the casing. Make sure the loose battery wire doesn't get snagged. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.