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Rechargeable batteries eventually degrade and lose their ability to hold a charge. Once this happens, the only fix is to replace the battery. Ensure that your device is powered off before beginning this step.
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Remove the six 5mm Phillips #00 screws from the back of device.
 
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Pry back cover off with a plastic opening tool just enough to see where the speaker is attached to the motherboard.
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Use a spudger to disconnect the speaker connection from the motherboard.
 
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Run the tip of a spudger between the battery and the housing to loosen the double-sided tape holding the battery in.
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Still using the spudger tool, pry the battery from the housing.
 
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Pull the edge of the tape up to remove the tape that holds the battery wire to the motherboard.
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Slowly pull the connection from the motherboard.
 
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To reassemble your device, follow these instructions in reverse order.
To reassemble your device, follow these instructions in reverse order.