31The computer operates on AC or battery power. Thischapter contains the information you need to know tooperate the computer on battery power. It also includesinformation on how your computer manages and savespower.ContentsBattery Pack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Battery Pack Characteristics . . . . . . . . . . . . . . 32Installing and Removing the Battery Pack . . . . 33Charging the Battery . . . . . . . . . . . . . . . . . . . . 34Charging Modes. . . . . . . . . . . . . . . . . . . . 34Checking the Battery Level . . . . . . . . . . . . . . . 35Using the Windows Battery Meter . . . . . . 35Optimizing Battery Life . . . . . . . . . . . . . . . . . . 36Battery-low Warning . . . . . . . . . . . . . . . . . . . . 37Power Management. . . . . . . . . . . . . . . . . . . . . . . . . 39Power Management Modes . . . . . . . . . . . . . . . 39Display Standby Mode . . . . . . . . . . . . . . . 39Hard Disk Standby Mode . . . . . . . . . . . . . 40Standby Mode . . . . . . . . . . . . . . . . . . . . . 40Hibernation Mode . . . . . . . . . . . . . . . . . . 41Operating on Battery Power2