Manual

30 Chapter 2 Life with Your MacBook Pro
Using the MacBook Pro Battery
WhentheMagSafepoweradapterisn’tconnected,yourMacBookProdrawspower
fromitsbuilt-inbattery.ThelengthoftimethatyoucanrunyourMacBookProvaries,
dependingontheapplicationsyouuseandtheexternaldevicesconnectedtoyour
MacBookPro.
TurningofeaturessuchasAirPortExtremeorBluetooth®wirelesstechnologyand
reducingscreenbrightnesscanhelpconservebatterycharge—forexample,when
you’retravelingbyair.Manyofyoursystempreferencesareautomaticallysetto
optimizebatterylife.
Youcandeterminethechargeremaininginthebatterybylookingattheeightbattery
levelindicatorlightsontheleftsideofyourMacBookPro.Pressthebuttonnexttothe
lights,andthelightsglowbrieytoshowhowmuchchargeremainsinthebattery.
Important: Ifonlyoneindicatorlightison,verylittlechargeisleft.Ifnolightsareon,
thebatteryiscompletelydrainedandtheMacBookProwon’tstartupunlessthepower
adapterisconnected.Pluginthepoweradaptertoletthebatteryrecharge.Formore
informationaboutbatteryindicatorlights,seepage55.
Youcanalsochecktheamountofbatterychargeremainingbyviewingthe
Battery(
)statusiconinthemenubar.Thebatterychargeleveldisplayedisbased
ontheamountofpowerleftinthebatterywiththeapplications,peripheraldevices,
andsystemsettingsyou’recurrentlyusing.Toconservebatterypower,close
applicationsanddisconnectperipheraldevicesnotinuse,andadjustyourEnergy
Saversettings.Formoreinformationaboutbatteryconservationandperformancetips,
gotowww.apple.com/batteries/notebooks.html.