Introduction
Tools
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            Turn the system badge flap over (1) and then remove the ten M2x3 screws that secure the base cover to the computer (2). 
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            Pry the edges of the base cover and lift it to remove it from the computer. 
 
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            Disconnect the battery cable from the system board [1]. 
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            Remove the seven M2x4 screws that secure the battery to the computer [2]. 
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            Lift the battery off the computer [3]. 
 
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            Pry the securing clips away from the memory module until it pops-up [1]. Then, remove the memory module from its connector on the system board [2]. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.
Dell official maintenance guide is available at: https://dl.dell.com/topicspdf/precision-...
The base base cover removal is documented in section 'Disassembly and reassembly'.
Raphaël Bleuse -