Sometimes, while you're playing a full-screen game, using a full-screen application on your laptop that you can't see the low battery notification at the system tray. So when the battery becomes 0%, your windows vista turns off suddenly without closing any running application. All unsaved work lost and you might go crazy. To help you out of this, Windows Vista has some advanced settings you may not know.
- Open Control Panel
Open the Power Options in Hardware and Sound
- On the Select a power plan page, click Change plan settings under the selected plan.
- On the Change settings for the plan page, next to Turn off the display and Put the computer to sleep, choose the display and sleep settings that you want to use when your computer is running on battery and when it's plugged in.
- Click Change advanced power settings.
- On the Advanced settings tab, expand the battery category, set Critical Battery action to Hibernate (on battery) and Critical battery level to 5%. Then click Apply button to save changes
Now whenever you battery becomes lower than 5%, your laptop will auto hebernate to save your session and turn off your computer. You can also change the action and/or the level to suit yourself.