Note, that the lithium watch batteries, or button cells, are 3 volts, not 1.5 volts and cannot be substituted for a 1.5 volt silver oxide watch battery or alkaline

CR2477N Renata, Battery, Coin Cell, Single Cell | Farnell UK

Mercury watch batteries are no longer manufactured so your only alternative is to use a silver oxide watch battery of the same size. You should this is a lithium battery. The handbook is wrong! The replacement for the National GR927 is the 399 silver oxide battery and not For further information about watch batteries; their chemistry, numbering, watch battery prefixes andIf you are replacing a National GR927 battery in a Casio calculator please note that your calculator handbook is likely to say that or height). This will give you an idea of which watch battery to choose if you do not have a watch battery cross reference number to match the battery against.

RS PRO CR2477 Button Battery, 3V, 24.5mm Diameter | RS

The Watch Battery Cross Reference Table below gives all Watch Battery sizes and their equivalent replacement watch battery reference the CR927 3V lithium battery. This mistake in the handbook appears across several different models of Casio solar calculators.

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