Dell Precision M90: Using a Battery Battery Performance

Using a Battery

Battery Performance

NOTE: For information about the Dell warranty for your computer, see the Product Information Guide or separate

paper warranty document that shipped with your computer.

For optimal computer performance and to help preserve BIOS settings, operate your Dell™ portable

computer with the battery installed at all times. One battery is supplied as standard equipment in the

battery bay.

NOTE: Because the battery may not be fully charged, use the AC adapter to connect your new computer to an

electrical outlet the first time you use the computer. For best results, operate the computer with the AC adapter

until the battery is fully charged. To view battery charge status, click Start→ Control Panel→ Power Options, and

click Power Meter tab.

NOTE: Battery operating time (the time the battery can operate the computer) decreases over time. Depending on

how often the battery is used and the conditions under which it is used, you may need to purchase a new battery

during the life of your computer.

Battery operating time varies depending on operating conditions. Operating time is significantly reduced

when you perform operations including, but not limited to, the following:

• Using optical drives.

• Using wireless communications devices, ExpressCards, or USB devices.

• Using high-brightness display settings, 3D screen savers, or other power-intensive programs such as

complex 3D graphics applications.

• Running the computer in maximum performance mode. See "Configuring Power Management

Settings" on in your

User’s Guide

for information about accessing Windows Power Options Properties

or Dell QuickSet, which you can use to configure power management settings.

NOTE: It is recommended that you connect your computer to an electrical outlet when writing to a CD or DVD.

You can check the battery charge before you insert the battery into the computer. You can also set power

management options to alert you when the battery charge is low. For more information, see "Checking

the Battery Charge" on page 14.

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 a battery from other computers with your computer.

CAUTION: Do not dispose of batteries with household waste. When your battery no longer holds a charge, call

your local waste disposal or environmental agency for advice on disposing of a lithium-ion battery. See "Battery

Disposal" in the Product Information Guide.

CAUTION: Misuse of the battery may increase the risk of fire or chemical burn. Do not puncture, incinerate,

disassemble, or expose the battery to temperatures above 65°C (149°F). Keep the battery away from children.

Handle damaged or leaking batteries with extreme care. Damaged batteries may leak and cause personal injury

or equipment damage.

Quick Reference Guide 13