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dont know sounds like its the magsafe transformer humming but im pretty sure it didn't do it on XP. I only hear it if the room is dead silent or if i have my ear near it (so not often) ive heard other people say the same thing, take it back and get a new power unit only to find the new one does the same. Maybe it needs a PMU update to the macbooks?
(Note: The 45W adapter was measured at home from a 2011 MBA with the "L" type MagSafe WITHOUT the attached 3-pronged cord. Aside: the 6 foot 3-pronged cord weighs 138 g. The data on the 85W and 60W adapters was gleaned from various internet sources with the ASSUMPTION that the weights are without the 3-pronged cord.)
To take advantage of the faster MagSafe charging, you need a 30W or higher power adapter, which Apple sells for $39. Of course, you can use a higher powered power source or a third-party power adapter as long as it delivers at least 30W. You also need one of Apple's new MagSafe chargers, which were released alongside the new iPhone models.
It's not uncommon for a MagSafe adapter to become very hot to the touch when charging. That being said, I'd make sure you have genuine Apple MagSafe adapters, and not some "knockoff", as knockoffs have a history of problems. I wouldn't trust or recommend any non-Apple battery or adapter, due to the number of problems reported with "knockoffs".
I used it with a 70W power adapter for several weeks and never had any trouble. You don't have to use MagSafe, either. The system can accept power over the USB-C ports, so you can use a standard USB-C power adapter (of appropriate wattage). I don't think M2 systems can accept the full 140W over the USB-C ports like the M3 systems can.
I'm thinking of upgrading to either a 13" MBA or 13" rMBP after the Haswell refresh, but I absolutely loathe the "T-shape" 180° MagSafe 2 adapter. It'd look so terrible sticking out of the side of my MacBook when docked. Moving back away from the 90° design is unquestionably one of Apple's biggest boneheaded decisions of the past few years.
Apple today shared a new support document explaining how to use the new MagSafe Duo Charger with iPhone 12 models and the Apple Watch, clarifying some details about the accessory following its release earlier this month. Notably, the support document confirms that Apple's older 29W USB-C...
Wouldn’t hold your breath: when MagSafe2 came out, Apple were still actually selling Thunderbolt 1 and Cinema displays with captive MagSafe 1 plugs, so they kinda had to make an adapter. Today, they haven’t sold anything with MagSafe 2 for years (and the last ones were for Airs so they’re not beefy enough for MBPs)
My old Intel MBP came with an 87W USB-C adapter, and I know I can fast-charge using a USB-C cable, but does fast-charging via MagSafe work with a power supply that isn't in Apple's list? It's not necessarily just a question of watts, because I can't find any documentation saying whether the MagSafe fast charging requires AVS or some other later ...
strength of magnet is great, feels almost like the original MagSafe. The male adapter doesn’t stick out too far from the thunderbolt port, about the size of a nano receiver from Logitech foe their mice/keyboards. im using it on a 2020 13” MBP. The adapter does not impede use of the adjacent port foe standard width cables.