NEC VERSA LX Service And Reference Manual page 16

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System Power Status LEDs — informs users of the system's current
power status.
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1-6 System Overview
System power status LEDs
A – Power Status LED
Power Status LED — lights green when system is using AC power.
When the system is using battery power, this LED lights to indicate
the following:
Lights green when the system power is on.
Blinks green when the system is in Suspend mode.
Lights yellow (blinks when in Suspend mode) to indicate that battery
power is at 8% capacity or less.
Lights amber (blinks when in Suspend mode) to indicate that battery
power is at 3% capacity.
Note:
When both the primary and a secondary
battery are installed, the power status LED indicates the
total (primary plus secondary) battery status.
Battery Charging LED — lights to indicate battery charging activity.
Lights amber when the primary battery is charging. Blinks amber to
indicate an error. The primary battery is installed in the battery bay.
Lights green when the secondary battery is charging. Blinks green to
indicate an error. The secondary (optional) battery is installed in the
VersaBay III.
B – Battery Charging LED