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This guide will walk through the steps of replacing the internal battery of a Magellan RoadMate 2120T-LM. This guide is also a prerequisite for replacing every other component of the device.
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Turn the GPS over on its backside and remove the six 3 mm Phillips #1 screws.
 
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Pry up on back panel with black spudger
 
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Disconnect battery and speaker cables from the motherboard at indicated places.
 
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Use a spudger to remove the battery from the back panel.
 
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               To reassemble your device, follow these instructions in reverse order.
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               To reassemble your device, follow these instructions in reverse order.