HP : LY849UA, : LW883AW Using battery power, Finding battery information, Using Battery Check

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Using battery power

When a charged battery is in the computer and the computer is not plugged into external power, the computer runs on battery power. When the computer is plugged into external AC power, the computer runs on AC power.

If the computer contains a charged battery and is running on external AC power, the computer switches to battery power if the AC adapter is disconnected from the computer.

NOTE: When you disconnect AC power, the display brightness is automatically decreased to save battery life. For information on increasing or decreasing display brightness, refer to the Getting Started guide.

You can keep a battery in the computer or in storage, depending on how you work. Keeping the battery in the computer whenever the computer is plugged into AC power charges the battery and also protects your work in case of a power outage. However, a battery in the computer slowly discharges when the computer is off and unplugged from external power.

WARNING! To reduce potential safety issues, use only the battery provided with the computer, a replacement battery provided by HP, or a compatible battery purchased from HP.

Computer battery life varies, depending on power management settings, programs running on the computer, display brightness, external devices connected to the computer, and other factors.

Finding battery information

Help and Support provides the following tools and information about the battery:

●Battery Check tool to test battery performance

●Information on calibration, power management, and proper care and storage to maximize battery life

●Information on battery types, specifications, life cycles, and capacity

To access battery information:

▲Select Start > Help and Support > Learn > Power Plans: Frequently Asked Questions.

Using Battery Check

Battery Check in Help and Support provides information on the status of the battery installed in the computer.

To run Battery Check:

1.Connect the AC adapter to the computer.

NOTE: The computer must be connected to external power for Battery Check to work properly.

2.Select Start > Help and Support > Troubleshoot > Power, Thermal and Mechanical.

3.Click the Power tab, and then click Battery Check.

Battery Check examines the battery and its cells to see if they are functioning properly, and then reports the results of the examination.

22 Chapter 4 Power management

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Contents HP Notebook Product notice Safety warning notice Iv Safety warning notice Table of contents VGA External cards and devices Security Page Page Introduction Finding more information about your new computerNetworking select models only Creating a wireless connectionIdentifying wireless and network status icons Turning wireless devices on or off Using HP Connection Manager select models onlyUsing a Wlan Using operating system controlsConnecting to an existing Wlan Setting up a new WlanProtecting your Wlan Inserting a SIM Using HP Mobile Broadband select models onlyRoaming to another network Using GPS select models only Removing a SIMUsing Bluetooth wireless devices Connecting to a wired networkBluetooth and Internet Connection Sharing ICS Using a modem select models onlyConnecting a modem cable Connecting a country- or region-specific modem cable adapterSelecting a location setting Viewing the current location selectionConnecting to a local area network LAN select models only Select Start Devices and PrintersPage Audio Using the media activity controlsMultimedia Checking audio functions on the computer Adjusting the volumeWebcam select models only Video DisplayPortHdmi Configuring audio for Hdmi Using CyberLink PowerDVD select models onlyIntel Wireless Display select models only Power management Shutting down the computerSetting power options Using power-saving statesInitiating and exiting Sleep Initiating and exiting HibernationUsing the power meter Using power plansViewing the current power plan Selecting a different power planCustomizing power plans Using HP Power Manager select models onlySetting password protection on wakeup Using Battery Check Using battery powerFinding battery information Displaying the remaining battery charge Maximizing battery discharge timeManaging low battery levels Identifying low battery levelsResolving a low battery level Conserving battery powerStoring a battery Replacing the battery Using external AC powerDisposing of a used battery Using HP CoolSense select models only Testing an AC adapterInserting a digital card Using Digital Media Slot cards select models onlyExternal cards and devices Using ExpressCards select models only Configuring an ExpressCardRemoving a digital card Inserting an ExpressCardRemoving an ExpressCard Using smart cards select models only Inserting a smart cardRemoving a smart card Using a USB deviceConnecting a USB device Removing a USB device Using 1394 devices select models onlyConnecting a 1394 device Removing a 1394 device Using an eSATA device select models onlyConnecting an eSATA device Using optional external devices Using optional external drivesUsing the expansion port select models only Removing an eSATA deviceUsing optional external devices Drives Handling drivesUsing hard drives Using Disk DefragmenterUsing Disk Cleanup Improving hard drive performanceManaging power with a parked hard drive Identifying HP ProtectSmart Hard Drive Protection statusUsing optical drives select models only Identifying the installed optical driveUsing HP ProtectSmart Hard Drive Protection software Inserting an optical discRemoving an optical disc Slot loadWhen the disc tray opens normally Slot load Using RAID select models only Sharing optical drivesProtecting the computer Using passwordsSecurity Setting passwords in Windows Setting passwords in Setup Utility BiosManaging an administrator password Entering an administrator passwordUsing antivirus software Using firewall softwareManaging a power-on password Entering a power-on passwordInstalling critical security updates Installing an optional security cableUsing the fingerprint reader select models only Locating the fingerprint readerMaintenance Cleaning your computerCleaning the display Cleaning the TouchPad and keyboardUsing SoftPaq Download Manager Setup Utility Bios and System Diagnostics Using Setup Utility BiosStarting Setup Utility Bios Changing the language of Setup Utility BiosDisplaying system information Navigating and selecting in Setup Utility BiosRestoring factory settings in Setup Utility Bios Determining the Bios version Exiting Setup Utility BiosUpdating the Bios Downloading a Bios update Select Start Help and Support MaintainUsing System Diagnostics Traveling with the computer Page Troubleshooting resources Electrostatic Discharge Symbols/Numerics IndexPasswords