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User’s Manual 6-13
Power and Power-Up Modes
P
OWER
AND
P
OWER
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U
P
M
ODES
Retaining data with power off
When you turn off your computer with fully charged batteries, the batteries retain
data for the following approximate time periods:
Battery pack (3 cell) about 1.8 days (Sleep mode)
about 15 days (Shutdown mode)
Battery pack (6 cell) about 3.5 days (Sleep mode)
about 30 days (Shutdown mode)
Battery pack (9 cell) about 5.5 days (Sleep mode)
about 50 days (Shutdown mode)
RTC battery about 3 months
Extending battery life
To maximize the life of your battery pack:
❑ At least once a month, disconnect the computer from a power source and
operate it on battery power until the battery pack fully discharges. Before
doing so, follow the steps below.
1. Turn off the computer’s power.
2. Disconnect the AC adaptor and turn on the computer’s power. If it does
not turn on go to step 4.
3. Operate the computer on battery power for five minutes. If the battery
pack has at least five minutes of operating time, continue operating
until the battery pack is fully discharged. If the battery LED flashes or
there is some other warning to indicate a low battery, go to step 4.
4. Connect the AC adaptor to the computer and the power cord to a power
outlet. The DC IN LED should glow blue, and the Battery LED should
glow amber to indicate that the battery pack is being charged. If the DC
IN indicator does not glow, power is not being supplied. Check the con-
nections for the AC adaptor and power cord.
5. Charge the battery pack until the Battery LED glows blue.
❑ If you have extra battery packs, rotate their use.
❑ If you will not be using the system for an extended period, more than one
month, remove the battery pack.
❑ Disconnect the AC adaptor when the battery is fully charged. Overcharging
makes the battery hot and shortens life.