User's Manual

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 Once a battery pack is removed, the display brightness level will be fixed at
a low level and cannot be adjusted.
 If a charged battery pack is not inserted within 2 minutes, the Battery Hot
Swapping Indicator blinks in red and the computer enters Hibernation mode.
 After removing the battery pack, do not connect and immediately disconnect the
AC adapter. This will shut down the computer
About the Bridge Battery
For models having the bridge battery:
 The bridge battery is not user-replaceable and is invisible to the operating system.
It never functions as the power source as long as the battery pack is installed.
 The bridge battery is charged by external AC power if the AC adapter is
connected.