What you need
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Use angled tweezers to peel up and remove the sticker covering the bottom-right speaker plate screw.
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Use a T5 Torx driver to remove the four 6.1 mm‑long screws securing the speaker plate.
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Use your fingers to swing the speaker plate to the side of the housing, making sure not to strain the cable.
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Use tweezers to firmly grip the edges of the battery connector.
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Gently rock the connector side-to-side and slide it out of its socket.
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Insert the flat end of a spudger underneath the battery.
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Pry gently to release the battery from the ear cup.
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Remove the battery.
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Tool used on this step:Tesa 61395 Tape$2.95
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Use your fingers to peel the foam pad from the battery.
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Transfer the pad onto the replacement battery.
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Apply a strip of double-sided tape to the foam pad.
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Use your finger to press the battery onto the ear cup such that the wires face towards the circuit board socket.
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