How much charge the battery contained to begin with.

How you use optional devices, such as a USB device, to which the battery supplies power.

Whether you enable Sleep Mode, which can conserve battery power if you are frequently turning the computer off and on.

Where you store your programs and data.

Whether you close the display panel when you are not using the keyboard - closing the display saves power.

The environmental temperature - operating time decreases at low temperatures.

Whether you enable Sleep and Charge function.

The condition of the battery terminals - you should always ensure the terminals stay clean by wiping them with a clean dry cloth before installing the battery pack.

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.

Battery type

Sleep Mode

Shut Down Mode

Battery pack

about 3 days

about 33 days

(48Wh, 6 cell)

 

 

Battery pack

about 4 days

about 45 days

(66Wh, 6 cell high

 

 

capacity)

 

 

RTC Battery

about 70 days

about 70 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.

1.Turn off the computer's power.

2.Disconnect the AC adaptor and turn on the computer's power - if it does not turn on then go to Step 4.

3.Operate the computer on battery power for five minutes. If you find that the battery pack has at least five minutes of operating time, continue operating until the battery pack is fully discharged, however, if the DC IN/Battery indicator flashes or there is some other warning to indicate a low battery condition, go to Step 4.

User's Manual

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Toshiba P850/P855 user manual Batteries exhausted time, Extending battery life, Battery type Sleep Mode Shut Down Mode