Replacing the Battery
Important!
fx-991CW+ UK sold in EU countries: For safety reasons, please do not replace the battery yourself. Always leave battery replacement up to an authorized CASIO service center.
If the screen shown below appears right after you turn on power, it means that remaining battery power is low.
A low battery is also indicated by a dim display, even if contrast is adjusted, or by failure of figures to appear on the display immediately after you turn on the calculator.
If this happens or the above screen appears, contact an authorized CASIO Service Center to have the battery replaced.
Important!
Removing the battery causes all of the calculator’s memory contents to be cleared.
