Dell Inspiron 3500 - Manual (Page 15)

System Overview 1-5
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Some devices located in the options bay (diskette drive, CD-ROM drive,
DVD-ROM drive, or Zip drive) also have an activity light indicating when the
device is being accessed.
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The battery charge gauge (see Figure 1-5) on the bottom of the battery has five
status lights that indicate how much battery charge remains. Each light indi-
cates approximately 20 percent battery charge. Press the battery tester (a
textured square on the back of the battery) to check the total battery charge.
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system power status light hard-disk drive activity status light battery status light
status lights (5)
battery tester