Introduction
Use this guide to disconnect the battery in the Nook Tablet. It is important to disconnect power before working on the Nook's internal components.
Tools
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            Lift the flap that reads "Nook" to reveal the tape that is underneath. Remove the memory card if one is present. 
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            Remove the tape covering the round holes to reveal two T5 Torx screws. 
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            Remove the two T5 Torx screws securing the back cover. 
 
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            Insert the flat end of a spudger between the front panel and the rear assembly. 
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            Use a spudger to lift the the back panel from the rest of the Nook. 
 
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            Lift up the foam pad at the corner of the battery to reveal the battery connector. 
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            Use a spudger or plastic opening tool to disconnect the battery cable from the motherboard. 
 
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To reassemble your device, follow these instructions in reverse order.