Resolving a low battery level

Resolving a low battery level when external power is available

Connect the computer to external power using one of the following devices:

AC adapter

Optional docking or expansion device

Optional power adapter purchased as an accessory from HP

Resolving a low battery level when a charged battery is available

1.Turn off the computer or initiate Hibernation.

2.Replace the discharged battery with a charged battery.

3.Turn on the computer.

Resolving a low battery level when no power source is available

Initiate Hibernation.

Save your work and shut down the computer.

Resolving a low battery level when the computer cannot exit Hibernation

When the computer lacks sufficient power to exit Hibernation, follow these steps:

1.Replace the discharged battery with a charged battery, or connect the AC adapter to the computer and to external power.

2.Exit Hibernation by briefly pressing the power button.

Conserving battery power

Turn off wireless and local area network (LAN) connections and exit modem applications when you are not using them.

Disconnect unused external devices that are not plugged into an external power source.

Stop, disable, or remove any external media cards that you are not using.

Decrease display brightness.

Initiate Suspend or Hibernation, or shut down the computer when you are not using it.

Storing a battery

CAUTION: To reduce the risk of damage to a battery, do not expose it to high temperatures for extended periods of time.

If a computer will be unused and unplugged from external power for more than 2 weeks, remove the battery and store it separately.

To prolong the charge of a stored battery, place it in a cool, dry place.

NOTE: A stored battery should be checked every 6 months. If the capacity is less than 50 percent, recharge the battery before returning it to storage.

Calibrate a battery before using it if it has been stored for one month or more.

34 Chapter 6 Power management

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HP ZBook 15 Mobile manual Conserving battery power, Storing a battery, Resolving a low battery level