Dell Inspiron 3800 System Reference Manual page 109

Power Sources: Dell Inspiron 3800 System Reference
Figure 1. Connecting the AC Adapter
Turning the Computer On
To turn on the computer, press the power button.
NOTE: If your computer's operating system is "locked up"—that is, it does not respond to commands—press and hold down the power
button for at least 5 seconds to shut it off.
Batteries
Your computer's battery provides power when an electrical outlet is not available. A battery in the battery bay is standard with the computer. Lithium-ion and
nickel-metal hydride (NiMH) batteries are longer lived than conventional batteries and do not require replacement as often. To double battery life, install a
second battery in the media bay. Lithium-ion batteries do not have the "memory effect" that is exhibited by NiMH and nickel-cadmium (NiCad) batteries. You do
not need to drain a lithium-ion battery completely before recharging it. A lithium-ion battery will not "forget" at which point it is fully charged. NiMH and NiCad
batteries may not charge fully if they are partially drained and then recharged.
The lithium-ion and nickel-metal hydride technology used in your computer's battery is significantly less hazardous to the environment than the lithium metal
technology used in some other batteries (such as watch batteries). Spent batteries should not be placed with common household waste products. Contact local
authorities for the location of a chemical waste collection program nearest you.
Keep the following information in mind when you are running your computer from the battery:
You can expect 2.5 to 5 hours of battery life with a single fully charged battery and 5 to 10 hours of battery life with two fully charged batteries. Actual
performance varies, depending on which power management features are enabled and which application programs are being used.
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1 AC adapter power cable
2 AC adapter
3 AC adapter cable