ドアベルのバッテリーの交換

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Pry the aluminum face-plate carefully using a plastic spudger while applying gentle pressure. This will reveal the 4 black screws underneath.
You will need a micro phillips screwdriver to remove these tiny screws. You will find that it requires considerable torque to loosen them, so to avoid stripping the head, really push in with the screwdriver while applying torque.

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