What you need
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The back cover can be easily removed by applying a small lever tool to the edge of the device. Twenty plastic clips fixate the back cover. Carefully lever the back cover off the device.
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In order to remove the battery first unplug the battery connector on the mainboard. Then unscrew a total of five screws (4x #00 and 1x Torx 5) that hold down the battery inside the device. The copper tape and some smaller patches of adhesives must be removed, too.
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As there are some cables alongside the metal frame of the battery, carefully remove the cables from the metal frame and lift up the battery, extracting it from the device.
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