Battery Status Lights - Dell Precision 3520 Owner's Manual

NOTE:
1 First Group: The LED blinks 1 to 9 times followed by a brief pause with LED off at the interval of 1.5 seconds.(This is in Amber
color)
2 Second Group: The LED blinks 1 to 9 times, that would be then followed by a longer pause before the next cycle starts again at
the interval of 1.5 seconds.(This is in White color)
For Example: No Memory detected (2,3), Battery LED blinks two times of amber color followed by a pause, and then blinks three times of
white color. The Battery LED will pause for 3 seconds before the next cycle repeat itself again.

Battery status lights

If the computer is connected to an electrical outlet, the battery light operates as follows:
Alternately blinking An unauthenticated or unsupported non-Dell AC adapter is attached to your laptop.
amber light and
white light
Alternately blinking Temporary battery failure with AC adapter present.
amber light with
steady white light
Constantly blinking Fatal battery failure with AC adapter present.
amber light
Light off Battery in full charge mode with AC adapter present.
White light on Battery in charge mode with AC adapter present.
Diagnostics 83