HP Elite X3 - Manual (Page 28)

Connect the lap dock to external AC power under any of the following conditions:
● When charging or calibrating a battery
● When updating the firmware
When you connect the lap dock to external AC power, the following events occur:
● The battery begins to charge.
● If the lap dock is turned on, the battery charge level lights blink.
When you disconnect external AC power, the following events occur:
● The lap dock switches to battery power.
● The display brightness is automatically decreased to save battery life.
22 Chapter 6 Power management