Using The Sleep Power State; Charging The Battery; Replacing The Battery - Dell Inspiron 1521 Owner's Manual

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Click the icon in the notification area, click Power Options, and then select a plan in the Select a power plan window.
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Using the Sleep Power State

Rather than shutting down your portable computer, use the Sleep power state to conserve power. Sleep automatically saves your work to your hard drive,
and then returns you to your previous work session without restarting your computer.
NOTICE: If your computer loses AC and battery power while in Sleep state, it may lose data.
To enter Sleep state:
Click Start , click , and then click Sleep.
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Depending on how you set the power management options in the Windows Power Options or Dell QuickSet, use one of the following methods:
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Press the power button.
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Close the display.
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Press <Fn><Esc>.
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To exit Sleep state, press the power button.
Charging the Battery
NOTE: Charge time is longer with the computer turned on. You can leave the battery in the computer for as long as you 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 connected to an electrical outlet, the computer checks the
battery charge and temperature. If necessary, the AC adapter then 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 not charge when you connect the computer to an
electrical outlet.
The battery is too hot to start charging if the battery light
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
Replacing the Battery
CAUTION: Using an incompatible battery may increase the risk of fire or explosion. Replace the battery only with a compatible battery purchased
from Dell. The battery is designed to work with your Dell computer. Do not use batteries from other computers with your computer.
CAUTION: Before performing these procedures, turn off the computer, disconnect the AC adapter from the electrical outlet and the computer,
disconnect the modem from the wall connector and the computer, and remove any other external cables from the computer.
NOTICE: You must remove all external cables from the computer to avoid possible connector damage.
NOTICE: If you choose to replace the battery with the computer in Sleep state, you have up to 1 minute to complete the battery replacement before
the computer shuts down and loses any unsaved data.
To remove the battery:
1. If the computer is connected to a docking device (docked), undock it. See the documentation that came with your docking device for instructions.
2. Ensure that the computer is turned off.
3. Turn the computer over.
4. Slide and click the battery release latches to keep them open.
5. Slide the battery out of the bay.
flashes alternately blue and amber. Disconnect the computer from the electrical outlet and allow
Power Problems.