Dell XPS 15Z (L511Z, Mid 2011) - Manual (Page 42)

40
Using Your XPS Laptop
Status Lights and Indicators
Display-Hinge Light
Indicator light status Computer state(s) Battery charge status
AC adapter solid white on/off/hibernate charging
breathing white standby charging
off off/hibernate fully charged
Battery solid amber on low battery (<= 10%)
breathing white standby > 10%
breathing amber standby low battery (<=10%)
off off/hibernate not charging