Dell XPS 14 (L401X, Late 2010) - Manual (Page 36)

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Using Your XPS Laptop
Status Lights and Indicators
Battery Status Light
Indicator light status Computer state(s) Battery charge status
AC adapter solid white on/standby/off/
hibernate
charging
off on/standby/off/
hibernate
fully charged
Battery solid amber on/standby low battery (<= 10%)
off on/standby/off/
hibernate
off/hibernate
not charging