Introduction
If your Samsung Odyssey NP800G5M is not powering on or charging, it is most likely due to a faulty/dead battery. The battery can be replaced in a few simple steps. However, take the necessary precautions.
Tools
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            Remove the eleven 6.6 mm screws on the back of the computer using the Phillips #0 screwdriver. 
 
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            Using the opening tool, gently pry apart the back corners until the plastic separates from the body of the laptop. 
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            Work your way around the body of the laptop until the back cover is completely separated. 
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            Remove the back casing. 
 
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            Remove the four 6.6 mm screws using the Phillips #0 screwdriver. 
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            Remove the battery from the device. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.