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The answer is YES. You can use the higher power Charger on lower power laptops. The battery will only take as much as it can handle. It is a pull not push process. Extra info: If you were to use lower power charger on high power laptop, you could end up newer charging the battery fully, or it could take extended time to charge.


No. The Thunderbolt port does not supply power to the laptop. The only way to provide power is through the MagSafe connector.


The second type simply does not charge the MBP. It is not possible to charge the laptop (MBP) through the Thunderbolt port.


Yes, this will still work. The situation you want to avoid is using the incorrect wattage.

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