Quote:
Originally Posted by Quoth
Coin devices should though have a screw on the cover. Some classic coin powered calculators have been updated to have that. It's deemed to reduce chance of a small child swallowing the cell.
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Sadly most of the devices I have that use a screw to secure the battery cover just use the device's plastic to hold the screw. After removing and replacing the screw a couple of times, it can be removed with a fingernail or just by tapping the device on a hard surface.