Dell Inspiron 3800 System Reference Manual page 111

Power Sources: Dell Inspiron 3800 System Reference
Use of the infrared port
When you activate standby mode, the computer can run on battery power for approximately one week (if the battery was fully charged before activating
standby mode).
If you are going to store the computer, disconnect all peripheral devices and turn off the computer. Remove the battery when you store your computer for an
extended period of time. A battery will drain when not in use during prolonged storage. After a long storage period, recharge the battery fully before you
attempt to run your computer from battery power.
Installing a Battery in the Battery Bay
NOTICE: To avoid data loss, do not replace a battery while the computer is turned on unless the computer is connected to an
electrical outlet or a second battery is installed.
To install a battery in the battery bay, perform the following steps (see
NOTES: You can also install a battery in the media bay.
If necessary, print these instructions for reference before proceeding.
Figure 2. Installing a Battery
1. Save your work and close all open files and application programs.
2. If the computer is docked, undock it.
3. If the battery bay contains a battery and your system is off, go to step 5.
4. If the only battery in the computer is in the battery bay and that is the battery you want to replace, preserve your data in one of these ways, and then
proceed to step 5:
Use the standby mode.
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Figure 2).