With re pe a ted dis cha rge s a nd recha rge s , the battery's capa city will
gra dua lly de cre a se . In vie w of this it will be note d tha t a n ofte n us e d,
olde r ba ttery will not ope ra te for a s long a s a ne w ba tte ry e ven whe n
both a re fully charge d.
Ma x im iz in g b a t t e ry o p e r a t in g t im e
A ba tte ry's usefulne s s de pe nds on how long it ca n s upply power on a
single charge , while how long the cha rge la s ts in a ba tte ry depe nds on:
Proce ssor s pe e d
Scre e n brightne s s
System S leep Mode
System Hiberna tion Mode
Display powe r off pe riod
Ha rd Disk Drive powe r off pe riod
How ofte n and for how long you us e the Hard Dis k Drive a nd e xte rnal
dis k drive s , for e xa mple , optica l disc.
How much cha rge the ba tte ry containe d to begin with.
How you us e optiona l de vice s , s uch a s a US B de vice , to which the
ba tte ry s upplie s powe r.
Whe the r you e nable S le ep Mode , which can conserve ba tte ry power if
you are fre que ntly turning the compute r off and on.
Whe re you s tore your progra ms a nd da ta.
Whe the r you clos e the dis play pa ne l whe n you a re not using the
keyboa rd - closing the displa y s a ve s power.
The e nvironmenta l te mpe ra ture - ope ra ting time de crease s at low
tempera ture s .
Whe the r you e nable S le ep a nd Cha rge function.
B a t t e rie s e x h a u s t e d t im e
Whe n you turn off the powe r of your compute r with ba tte ries fully cha rged,
the ba tte rie s will be exha usted within the following a pproximate period.
Ba tte ry typ e Slee p Mo d e Shu t Do wn Mod e
Battery pack (48Wh, 6
ce ll)
about 4 da ys about 44 da ys
Battery pack (47Wh, 8
ce ll)
about 3 da ys about 44 da ys
Ex t e n d in g b a t t e ry life
To maximize the life of your ba tte ry packs :
Use r's Ma nua l 4-31
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