Introduction
Sometimes a CMOS battery needs to be replaced or re-seated - in this laptop, that’s a fairly simple and straightforward process. You’ll need a PH0-head screwdriver and a plastic tool to pry the battery from its socket.
Tools
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            Flip the laptop over, so that the "top" of the laptop is against your working surface. 
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            Orient the laptop so that the silver label is in the bottom-left corner, with the battery facing you. 
 
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            On the right side of the battery, move the tab marked 1 to the right, unlocking the battery. 
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            On the left side of the battery, hold the tab marked 2 to the left while pulling the battery towards you. 
 
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            Rotate the laptop so that the battery cavity faces away from you. 
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            Unscrew the single PH0-head screw connecting the center panel to the laptop. 
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            Using a plastic spudger, unclip and remove the panel from the device. 
 
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To reassemble your device, follow these instructions in reverse order.