CASIO

Even if the calculator is operating normally, replace the battery according to the schedule shown below. Continued use after the specified number of years may result in abnormal operation. Replace the battery immediately after display figures become dim.
fx-570ES PLUS/fx-9910NG PLUS: Every 2 years
fx-991ES PLUS: Every 3 years

A dead battery can leak, causing damage to and malfunction of the calculator. Never leave a dead battery in the calculator.

The battery that comes with the calculator is for factory testing, and it discharges slightly during shipment and storage. Because of these reasons, its battery life may be shorter than normal.

Do not use a nickel-based primary battery with this product. Incompatibility between such batteries and product specifications can result in shorter battery life and product malfunction.

Avoid use and storage of the calculator in areas subjected to temperature extremes, and large amounts of humidity and dust.

Do not subject the calculator to excessive impact, pressure, or bending.

Never try to take the calculator apart.

Use a soft, dry cloth to clean the exterior of the calculator.

Whenever discarding the calculator or batteries, be sure to do so in accordance with the laws and regulations in your particular area.