Find common Casio / G-Shock battery codes by model or module, then check difficulty and safety steps.
Many G-Shock modules use CR2016 or CR2032. Example: F-91W module 593 commonly uses CR2016. Confirm on the module stamp before buying.
1. Note settings.
2. Confirm battery code.
3. Check moisture/corrosion.
4. Do not pry on the crystal.
5. Stop if gasket area looks damaged.
How do I know what battery my Casio takes? Module number + printed battery code are most reliable.
Where is the module number? Caseback and/or on the module inside.
What battery do G-Shocks use? Often CR2016 or CR2032, but confirm by module.
Should I replace it myself? Some are easy; corrosion or difficult cases need care/pro help.