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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.
If the Battery Hot Swapping Indicator blinks in amber, it means the
bridge battery charging is in an abnormal state. Replace the bridge
battery in case this happens.