AC adapter for MacBook, MacBook Pro, and MacBook Air

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System Information showing wrong wattage

I performed this fix on a 85W Magsafe adapter and when I hooked it up to test it, the Power selection in System Information shows that the wattage for the AC charger is 45W, not 85W.

I suspect the L-tip has something in it that tells the Macbook that it's 45W. The wire gauge of the replacement cord is much smaller than the original 85W cord.

Does anyone know where to get the heavier duty cords?

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1 Answer

The charger information is in the MagSafe connector and transferred to laptop via 1-Wire protocol. So, if you changed the cable (including the connector), that's the reason. So the cords doesn't change the wattage detection, the connector does. (Of course you'll need heavier duty cords for more current thus more wattage, it would not be safe if not suitable cords are used, probably it works, but it may produce heat and damage the cord)

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