Introduction
This is how to replace the rechargeable battery. If you notice that your computer isn't keeping a charge, or doesn't work off of a charger, it most likely needs a new battery.
Tools
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Unscrew the 12 back screws, circled in red. The top 8 screws are 4.90mm x 5.71mm.
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The 4 blue screws on the bottom are 4.81mm x 4.6mm.
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Looking at the inside of the device, locate the battery plug, and remove it.
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The clip connector should pull out after a little bit of force is applied. But do not pull on the wires, pull on the white plastic part.
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Conclusion
To reassemble your device, follow these instructions in reverse order.