20Useful Informationn Preventing your computer from unauthorized use via wireless LAN/Bluetooth/wireless WANl Before using wireless LAN/Bluetooth/wireless WAN, make the appropriate security settings such as data encryp-tion.n Battery Recalibrationl The battery recalibration may take a long time due to the large battery capacity. This is not a malfunction.Only for model with CF-VZSU46AU Full charge: Approximately 4.5 hours (with Main Battery) / 8.0 hours (with Main Battery + Second Battery) Complete discharge: Approximately 4.0 hours (with Main Battery) / 6.0 hours (with Main Battery + Second Bat-tery)Only for model with CF-VZSU72U Full charge: Approximately 2.5 hours (with Main Battery) / 6.0 hours (with Main Battery + Second Battery) Complete discharge: Approximately 3.0 hours (with Main Battery) / 6.0 hours (with Main Battery + Second Bat-tery)When performing "Battery Recalibration" without shutting down Windows, it may take more time to charge / dis-charge.MaintenanceTo clean the LCD panelIf drops of water or other stains get on the surface of the LCD panel, wipe them off immediately. Failure to do so mayresult in staining.Use the soft cloth included with the computer. (For further information, refer to “Suggestions About Cleaning the LCDSurface”. è Reference Manual “Screen Input Operation”)To clean areas other than the LCD panelWipe with a soft dry cloth such as gauze. When using detergent, dip a soft cloth in water-diluted detergent and wring itthoroughly.CAUTIONl Do not use benzene, thinner, or rubbing alcohol since it may adversely affect the surface causing discoloration, etc.Do not use commercially-available household cleaners and cosmetics, as they may contain components harmful tothe surface.l Do not apply water or detergent directly to the computer, since liquid may enter inside of the computer and causemalfunction or damage.Handling and Maintenance