what happens if power supply is 90 w instead of 120 w

CraigN

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Aug 15, 2013
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The battery won't charge as fast, and it could have negative effects on the battery's long term ability to hold the same charge if you use a lower-power charger.

There's also a possibility that it just flat out won't charge because the laptop will see it as incompatible (much like your cell phone does if you plug it into too weak a charger), or is consuming more energy than your charger is providing. I would recommend you stick with the power adapter it comes with, unless there is something wrong with it, then I would replace it with one of equal power.
 
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