Using a Battery 29Low-Battery WarningNOTICE: To avoid losing or corrupting data, save your work immediately after a low-battery warning.Then connect the computer to an electrical outlet. If the battery runs completely out of power, hibernate modebegins automatically.A pop-up window warns you when the battery charge is approximately 90 percent depleted. For moreinformation about low-battery alarms, see "Power Management" in the Dell Inspiron Help file. To access thehelp file, see "Finding Information" on page 9.Charging the BatteryNOTE: The AC adapter charges a completely discharged battery in approximately 2 hours with the computerturned off. Charge time is longer with the computer turned on. You can leave the battery in the computer as long asyou like. The battery’s internal circuitry prevents the battery from overcharging.When you connect the computer to an electrical outlet or install a battery while the computer is connectedto an electrical outlet, the computer checks the battery charge and temperature. If necessary, the AC adapterthen charges the battery and maintains the battery charge.If the battery is hot from being used in your computer or being in a hot environment, the battery may notcharge when you connect the computer to an electrical outlet.The battery is too hot to start charging if the light flashes alternately green and orange. Disconnect thecomputer from the electrical outlet and allow the computer and the battery to cool to room temperature.Then connect the computer to an electrical outlet to continue charging the battery.For more information about resolving problems with a battery, see "Power Problems" on page 63.