Power Management Battery Saving States Sleep or standby

Power Management

Battery Saving States Sleep or standby Display and hard disk turn off All programs and data are still in RAM Power needed to support RAM Take a little time to wake up Hibernation Everything (programs and data) are saved on the hard disk. Use much less power than Sleep Take longer to wake up than Sleep Power Off Everything is saved, provided it was shut down properly The computer does not use any power Take longest to wake up (boot up)

Power-saving tips Turn display brightness to the lowest comfortable level Turn off wireless(WIFI) if not needed Turn off Bluetooth if not needed Take CD/DVD out Stop programs that are not being used Turn off keyboard backlight or low Keep the laptop cool

Power Management Settings Mac On Battery or On Power Adapter Computer sleep Display sleep Hard disk to sleep when possible Dim display Auto reduce brightness

Power Management PC Balanced (on battery or plugged in) Dim display Turn off display Put computer to sleep Adjust display brightness Power Saver Dim display Turn off display Put computer to sleep Adjust display brightness

Advanced Power Options for PC Power buttons and lid Lid close action: On battery: do nothing/sleep/hibernate/shutdown Plugged in: do nothing/sleep/hibernate/shutdown Display Dim display after: On battery: # minutes Plugged in: # minutes Turn off display after On battery: # minutes Plugged In: # minutes

Advanced Power Options for PC Battery Critical battery action On battery: sleep/hibernate/shutdown Plugged in: Do nothing/sleep/hibernate/shutdown Critical battery level On battery: 5% Plugged in: 5% Processor power management System cooling policy On battery: passive Plugged in: passive

Extend Battery Life Keep battery contacts clean Completely charge it the first time Charge battery correctly Nickel-based (Ni. MH): completely drain it and recharge it how often? read the owner’s manual Lithium Ion: Don’t plug in all the time Can be partially discharged and recharged NEVER fully discharge it Keep 50% for long-term storage Discharge/recharge at least once per month

References http: //www. microsoft. com/atwork/maintenance/battery. aspx http: //www. apple. com/batteries/notebooks. html http: //support. apple. com/kb/ht 1446