The {platform} uses a standard, non-rechargeable CR2032 battery. SwissMicros recommends using a reputable brand battery. It is easy to replace and only requires a Phillips screwdriver. Here are the steps to do it.
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Make sure you keep all your programs and memory by saving a state file from the File menu.
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Lay the unit on a soft, flat surface with the backplate facing up.
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Remove the Phillips screws at the top of the case (2×).
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Lift the top edge of the backplate about 10° or 12mm or ½in.
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Slide the backplate backwards.
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Use a soft, non-conductive material, like a toothpick or a plastic spudger, to push the dead battery out of its compartment.
Slide in a fresh battery. The positive terminal faces up and away from the PCB. Follow the above steps backwards until the calculator is closed. Do not over-torque the screws.