Toshiba Satellite R830 - Manual (Page 159)

Batteries exhausted time
When you turn off the power of your computer with batteries fully charged,
the batteries will be exhausted within the following approximate period:
Retention Time for R850 series
Battery type Sleep Mode Shut Down Mode
Battery pack (48Wh, 6
cell) about 4 days about 75 days
Battery pack (66Wh, 6
cell) about 5 days about 100 days
RTC battery about 30 days about 30 days
RTC battery (High
Capacity) about 90 days about 90 days
Retention Time for R840 series
Battery type Sleep Mode Shut Down Mode
Battery pack (66Wh, 6
cell) about 5 days about 70 days
Battery pack (93Wh, 9
cell) about 5 days about 105 days
RTC battery about 30 days about 30 days
Retention Time for R830 series
Battery type Sleep Mode Shut Down Mode
Battery pack (66Wh, 6
cell) about 5 days about 115 days
Battery pack (93Wh, 9
cell) about 7 days about 165 days
RTC battery about 30 days about 30 days
Extending battery life
To maximize the life of your battery packs:
At least once a month, disconnect the computer from a power source
and operate it on battery power until the battery pack fully discharges.
Before doing so, follow the steps as detailed below.
R850/R840/R830
User's Manual 5-8