can i use a 90 watt charger on a 45 watt laptop
Yes, you can use the 85 Watt Power Supply (or 65 Watt) on the Macbook Air (Late 2010). I just spoke to Apple Support and they stated it was no problem.The MacBook Air would only draw what it needed from the more powerful Powersupplies. So if you already own a 65 or 85W, you can safely use it with the Air.he device will not charge any faster with a higher wattage charger, or charge more. Using a higher wattage charger with a lower wattage laptop is like using a light fixture that can support a 200 watt bulb with only a 75 Watt bulb. No problem. 1  Answered by Norman M from Cambridge.