Why is your notebook not getting the battery life it's rated at even right out of the box? Are you doing something wrong or just different
than what was done during testing to determine the specs?
Well, I highly doubt you're doing anything really wrong, but there are probably things you can do better
for more battery life. As for comparing it to what some companies rate their system at... good luck, those are often optimum conditions with a very light load.
Ni-Cad (Nickel Cadmium battery), and Ni-MH (Nickel Metal Hydride) were once highly used having 1.2 Volts per cell.
Li-Ion (Lithium-ion) have now taken their place having 3.6-3.7 Volts per cell and are much more practical for today's power hungry notebooks. They have more power, higher voltage, less self drain, less weight, and can be smaller for the power you get. You will also not find the memory problems previous batteries were known for. I guess the only drawback is they're more expensive.
You will find most if not all of today's notebooks use Li-Ion smart batteries. The fact that it's smart means it has circuits that report its charge level so you can estimate the battery life remaining or when it's about to run out.
Batteries are over-all measured in "mAh" (Milliamps/hour)
Below (click image to enlarge) is an opened Sager 8890 Li-Ion battery pack.
While the cells are arranged in 3 groups of 4 cells, it's actually wired to work as 3 parallel rows in 4 series to make its rated 14.8V. The circuit board you see is for distribution and smart circuitry. You will find this similar to most every smart Li-Ion battery pack used in notebooks.
Getting more minutes on a charge
There are many things you can do to increase your battery life at the cost of performance, comfort, and features. What many will do that need to maximize their battery life for example if they're going on a trip, is get their settings in order before heading out. Here's a few things you can do:
Adjust LCD brightness
Most notebooks will be set to dim the LCD automatically by default from the factory. Unplug your system to check the brightness to verify. Some will do it over a few seconds slowly so you don't notice it so you have to watch carefully. If you feel you could deal with the display being even more dimmed, then (Windows) right click your desktop background, go to "Properties", then click the "Settings" tab at the top. Click "Advanced" and you will often find your settings for brightness in there which can vary depending on the graphics chipset and software on your system. Sometimes you can find the graphics control panel or settings hot link in your lower right hand system tray depending on software.
Turn it down to whatever you're comfortable with. The LCD is one of the biggest battery hogs most laptops face keeping fed.
Set powersave modes
Every time you take a 5-10 min break to run to the bathroom, talk, or think without computer intervention, you need to set your notebook up to do what you want during that time.
Right click your desktop background and go to "Properties", click the "Screen Saver" tab. If you're planning on having the screen saver kick on, set it to "Blank" in the pulldown menu, then move on to the "Power" button you see below that.
Hitting the power button should bring up a display with 5 tabs across the top on most notebooks running Windows XP:
On the power schemes tab you will have a pull down menu for different schemes. These schemes have default settings which you can adjust using the menus below, so it really doesn't matter which you modify as the selected one is the one you're using. You can set up multiple ones for times you want different preset settings.
The first setting you can set is your turn off monitor. This is as simple as it sounds, it cuts power to the LCD after the period of time you choose in which there is no interaction with the computer (mouse or keyboard movement). This, and the others are custom settings that work for you. The faster you set it to shut things off the better to keep the battery going, but set it too low and you may get annoyed. If you're reading a large article spending minutes at a time looking at the screen reading without touching the mouse or keyboard it can get annoying if your LCD is shutting off to save power.
The second setting you should see is to turn off hard disks. You probably don't want to set any of these options to happen faster than the option above it, but may want to set them for the same time. This setting spins down the hard drives to save power.
The third setting you should see is system standby. System standby will cut power usage drastically by shutting off power to unused devices and throttling down the used ones.
The fourth and last option will be for hibernate. This will only show up if you have hibernate enabled under the "Hibernate" tab. Hibernate uses software to take all your settings and applications down as they currently are and places the image on your hard drive before shutting down the computer. It's a full shut down. When recovering from hibernation, it's basically booting up from the image to have everything open and running exactly as it was. Both standby and hibernate have been known to be buggy with some systems. It's recommended you try them both out manually to look for any issues and also have all your Windows updates. Wherever possible, I'd use standby over hibernate. Keep in mind Hibernate also can take much longer to recover from if you walk back and want an instant response.
Your alarm settings can be modified here.
Shows current batteries and their power level status.
Advanced is where you set up your manual enabled power savings. If you know you're getting up for 30+ minutes, no need to let the timer enable your power settings, you set them here to manually enable. You may choose to close the lid when you walk away to enable the feature, or you may set it for the power button or the sleep button if your notebook has that.
So, you can set it to when you close the lid to go into standby and the system should come out of standby when you come back opening the lid and interact.
This is simply where you enable Hibernate and apply it. The hibernate option will not show up in the other menus unless it's enabled here.
Disable unused devices
If you have devices you're not needing when on battery power, disabling them can also save you power. Right click "My Computer" and go to "Manage". In the window that comes up, click the device manager link to open it up to the right as shown. Expand the menus by clicking the "+" next to the items to show the devices in that category. Once you highlight the device, you will see the disable icon pop up all the way to the right top bar of the window as shown in the picture.
Things to disable that you're not using:
The list can expand or shrink depending on what devices you don't need and what your notebook has in it. For example, if you have a system with 2 internal hard drives not in raid, you may want to disable the 2nd hard drive for battery savings when you need it.
Remove external add ons
If you have those nifty USB lights and fans and need battery life, yank em. If you have any camera memory in a card reader you don't need, remove and disable it. PCMCIA cards for wireless or whatever you have it for can be removed if you're not using it on battery. This should be a given, but many people don't realize the power these things can pull.
Disable unused services
Any program you may have running in the background shut it down. You can close many apps by right clicking them in the lower right menu or system tray. Or you can stop programs from starting up during boot up by going to Start/Programs/Startup and also going to start/run and typing "msconfig".
Notebook battery conditioning for the long haul