Introduction
Parts
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Pull the switch with the arrow next to it in the direction of the arrow.
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You should be able to see the battery extrude from the case.
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Pull, gripping onto the newly extruded area on the battery, removing it.
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Add the new battery in its place and you're done :)
 
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                            Conclusion
                          
                          Flip laptop over and enjoy your newly acquired battery runtime!