I was dying to have one in my portfolio as a backup power source. I tried it when it arrived. I've noticed that the screen brightness fluctuates from bright (on a normal charge) to dim (on a normal battery). Then I noticed that the loading icon on my system was also pulsing. I immediately removed the charger. I'm not sure if this is a simple one-time defect or a system feature of the charger, but I won't risk ruining a $3,500 laptop.
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