The second low-battery warning—a steady amber battery status indicator—occurs when you have about 5 minutes of battery life left under current conditions

and the computer is not connected to an electrical outlet.

After the second low-battery warning, if no further I/O activity occurs within 15 seconds, the computer activates S2D mode. If there is no S2D partition, the

computer enters standby mode. The computer can preserve data for several hours in standby mode.

If the computer is already in standby mode when a final low-battery warning occurs, the computer activates S2D mode immediately. If S2D mode has been

disabled, the computer reenters standby mode.

NOTICE: If your computer uses a nickel-metal hydride battery and you ignore the first low-battery warning, the computer may

activate S2D mode before displaying a second low-battery warning.

NOTICE: To avoid losing data (and possibly corrupting data areas on your hard-disk drive), save your work immediately after a

second low-battery warning. Then connect your computer to an electrical outlet, or place the computer in standby mode. If the

battery runs completely out of power, the computer shuts off without properly closing any open files.

Charging the Battery

Each time you connect the computer to an electrical outlet or install a battery in a computer that is connected to an electrical outlet, the computer checks the

battery's charge. The AC adapter charges the battery (if needed) and then maintains the battery's charge.

NOTE: For maximum battery performance, charge the battery only at normal room temperature.

If two batteries are installed in the computer, the AC adapter first charges the battery in the battery bay and then the battery in the media bay. When you

charge two lithium-ion batteries, one battery partially charges, then the second battery partially charges, then both batteries completely charge. When you

charge two nickel-metal hydride batteries, one battery will fully charge and then the second battery will fully charge.

When installed in a computer connected to an electrical outlet, the battery immediately starts charging. The green power indicator remains steady while the AC

adapter charges the battery. The indicator starts blinking when the express charge cycle is complete. While the indicator is blinking, the AC adapter provides a

trickle charge to bring the battery to full capacity. The indicator continues to blink until you remove the battery or disconnect the computer from its electrical

outlet.

NOTE: When charging a nickel-metal hydride battery, you may see a sudden rise in the reported charging percentage from partially

charged to fully charged.

NOTICE: If the battery status indicator flashes alternately green and amber while the computer is connected to an electrical outlet,

disconnect the computer from the outlet and allow the computer and the battery to return to room temperature. Then reconnect the

computer to its electrical outlet and continue charging the battery. If the computer is not allowed to return to room temperature, the

battery stops charging before it reaches full capacity.

If the computer is turned off and connected to an electrical outlet through the AC adapter, it takes the AC adapter about 1 hour to fully charge a lithium-ion

battery that has been completely discharged, and 2.5 hours to fully charge a nickel-metal hydride battery. If the computer determines that the battery is near

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