Quick Reference Guide 15Using a BatteryBattery PerformanceNOTE: For information about the Dell warranty for your computer, see theProduct Information Guide or separate paper warranty document that shipped withyour computer.For optimal computer performance and to help preserve BIOS settings,operate your Dell portable computer with the main battery installed at alltimes. One battery is supplied as standard equipment in the battery bay.NOTE: Because the battery may not be fully charged, use the AC adapter toconnect your new computer to an electrical outlet the first time you use thecomputer. For best results, operate the computer with the AC adapter until thebattery is fully charged. To view battery charge status, check the Power Meter inPower Options (see "Accessing Power Options Properties" in your User’s Guide).Battery operating time varies depending on operating conditions. Operatingtime is significantly reduced when you perform operations including, but notlimited to, the following:• Using optical drives.• Using wireless communications devices, PC Cards, ExpressCards, mediamemory cards, or USB devices.• Using high-brightness display settings, 3D screen savers, or other power-intensive programs such as complex 3D graphics applications.• Running the computer in maximum performance mode. See "ConfiguringPower Management Settings" in your User’s Guide for information aboutaccessing Windows Power Options Properties or Dell QuickSet, which youcan use to configure power management settings.NOTE: It is recommended that you connect your computer to an electrical outletwhen writing to a CD or DVD.You can check the battery charge before you insert the battery into thecomputer. You can also set power management options to alert you when thebattery charge is low.CAUTION: The battery is designed to work with your Dell computer. Using anincompatible battery may increase the risk of fire or explosion. Replace thebattery only with a compatible battery purchased from Dell. Do not use a batteryfrom other computers with your computer.