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On the charger block, you will see output voltage and output amperage. Mutilpy those, and that will give you the wattage. What many folks don't realize is the VML will drain in, say, an hour or two while the laptops internal battery will last for 3-4 hours or more. This is because those rating on the charger are when the battery is being charged (a higher draw). So it is running the computer and charging the battery, so naturally it will drain rapidly. But much of the VML power has transfered to the laptop's battery.
I suspect the numbers are lower than the charger block indicates when the battery is full, but to my knowlege, those are un published in most instances.
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