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the CR927 3V lithium battery. This mistake in the handbook appears across several different models of Casio solar calculators. If you are replacing a National GR927 battery in a Casio calculator please note that your calculator handbook is likely to say that For further information about watch batteries; their chemistry, numbering, watch battery prefixes and this is a lithium battery. The handbook is wrong! The replacement for the National GR927 is the 399 silver oxide battery and not
The Watch Battery Cross Reference Table below gives all Watch Battery sizes and their equivalent replacement watch battery reference battery for PDA such as Psion etc), glucometer, camera, electric thermometer, calculator, computer equipment The CR2412 cell is used in many film watches and perpetual calendar watches from Casio, Seiko, Panasonic, Citizen and other manufacturers. 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 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.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