What you need
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Turn off the laptop and remove power cable.
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Flip the laptop upside down.
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Remove the labeled screws with Phillips #0 screwdriver.
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Disconnect the battery by removing the labeled screws and lifting the battery upwards from the box-labeled connector.
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Battery disconnecting is very important to do before any replacements!
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Conclusion
To do some cleaning or replacement operation, you need to disassembly your laptop with this guide.