why not long enough for laptop battery lasting

Tips on conserving laptop power; more on Serial ATA power cables; check backup discs for errors.
Send your tips and questions to mybatterybase@gmail.com. We pay $50 for published items. Kirk Steers is a PC World contributing editor.

Sooner or later, every laptop battery owner asks the same question: How long will my battery last? For most people, sadly, the answer is the same: not long enough. But there are plenty of things you can do to squeeze every last minute of power out of your notebook's battery.

Use power management: Judicious use of your notebook's power-management software can translate into many minutes of extra computing time. If your notebook comes with a power console applet that lets you create customized power profiles, use it to adjust the settings until you get the right mix of functions and battery life. If your laptop Hp EV088AA battery doesn't have such a program supplied by the notebook vendor, use Windows' perfectly adequate Power Options utility in Control Panel (it's called Power Management in Windows 98).

Dimmer is a winner: A big laptop energy sink is its LCD screen. Reducing the screen's brightness conserves battery life. For example, when I work on a red-eye flight, I can squeeze up to 45 additional minutes out my Sony VAIO notebook by toning down the screen brightness. Most notebooks have an easy-to-access keystroke sequence, function (Fn) key, or software utility for adjusting this variable.

If a dim screen is good for battery life, a blank one is better. Windows' Power Options/Power Management utility lets you tell your notebook how long to wait before blanking the screen. In Windows XP and 2000, open Control Panel, select Performance and Maintenance (if you're in Category view), and click or double-click Power Options. In Windows 98, open Control Panel and double-click Power Management. dell 700m batteryOn the Power Schemes tab, choose Portable/Laptop in the 'Power schemes' drop-down menu. In the menu next to 'Turn off monitor', choose the length of time the screen can sit idle before it goes blank (see FIGURE 1

Figure 1: Use Windows' power options to set your screen to shut down frequently.

). The shorter the interval, the more power you'll save. The shortest option, 'After 1 min', may drive you nuts, however.

The Power Options and Power Management programs have settings for your notebook's other big power glutton--the hard drive--as well. Once again, you'll need to find the setting that works best for you. Remember to reduce the frequency of auto saves in PIMs, word processors, and other software; your hard drive may otherwise lose power-saving sleep.

Go unplugged: Remove Sony VGP-BPL2 batteryPC Cards and USB or FireWire devices that you don't need. If your PC has a built-in wireless card, turn it off or disable it when not in use. 

Make like a bear: Most PCs have Hibernate and Suspend modes that are easy to activate from the keyboard. Check your notebook's documentation for its setting. Suspend (also called Stand By mode) typically holds your current information in RAM with a minimum of power, so the system comes back to life quickly. Hibernate writes everything to disk and shuts off, so it saves more power than Suspend, although it also makes reactivating your PC take longer. Still, awakening a hibernating system is much faster than cold-booting one that has been turned off.

Lean is green: To keep your laptop's CPU from doing unnecessary work, shut down any hardware or software you don't need. Check the icons in your system tray (on the bottom right near the clock); there's a good chance you can shut most of these down, though they will likely restart the next time Windows loads. Browse to last June's Windows Tips column, "Make Windows Start and Stop the Way You Want," and scroll down to "Stop Autostart Apps" for instructions on how to disable programs that start automatically with Windows.