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I am using Sony Vaio and laptop charger burned its rating was 19.5V-3.9A, i am trying to find the same model but I have been only been able to find one with the rating 19.5V-4.7A. Can I use this, any pro's and cons. FYI my battery has already worn out!

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Make sure the polarity is also the same (e.g., center pin positive), or else you'll let the smoke out and the laptop won't work any more. ;) –  rob Apr 9 '12 at 19:10
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2 Answers

up vote 4 down vote accepted

No problem - your notebook will only draw the required amount of current from the adapter.

It is dangerous when you have a lower current rating on your adapter, as the notebook will draw more than what the adapter can give, thus causing potential fire hazards, or your notebook won't charge, etc.

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As long as current rating is higher than original one, there is no cons. Device will use as much current as it needs (or it was designed to).

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