Hi
Was just wondering if anything will be damaged if I use the 140W power adapter which came with the 16" 2021 M1 MacBook Pro to charge my old 2015 MacBook Pro which uses the 85W power adapter? Is it ok or should I get a new 85w for the old Macbook?
MacBook Pro
What if i use a usb-c to MagSafe 2 adapter cable?
What if i use a usb-c to MagSafe 2 adapter cable?
Additional information:
With this cable (usb-c to MagSafe 2) plugged from the 140W power adapter to a 2015 MacBook Pro.
As a compromise for the short run, if it works it works if not then its waste of time. So im asking if anyone knows?
The 2015 will not charge by USB-C -- it does not have any USB-C ports. The newer MagSafe will not fit the older 2015 Mac. Newer MagSafe uses a different power negotiation Protocol, which is more similar to USB-C Power Delivery.
You should get a new Power adapter, and you should use it most of the time, unless you literally have no AC power available.
Because a power adapter is $100 and a cable is $15, also im not using it much now that I have a new machine, but would be nice to have access to it so I can clean it up. Unfortunately my cat had a feast on the cable.
Ah, now I see where you want to go with this. You want a compromise for the short run, not necessarily a robust solid solution for daily use.
Macs do not charge simply by asserting a voltage against the power inlet. They require a power-level negotiation, which even the original MagSafe-1 performed with its smart power adapter. Later power adapters use a different protocol, but those adapters you speak of may translate.
Provided you use a substantial power adapter at least the wattage of the original (about 80 watts or higher in this case) damage is unlikely, regardless of what you use. IF it charges at all, it will likely do so appropriately, because the COMPUTER is in command of the entire process, and it will never over-charge.
Using a far too small power adapter could be problematic, except for emergency charging when the computer is nominally off.
To answer your question a MagSafe 2 won't work on your 2015 because it's physically different in both size and pin layout. IMHO if you are still going to use the '15 (even occasionally) just get the correct power adaptor.
Why not just buy the power adapter apple intended you to use, and not worry about incompatibilities.
Sure. Thanks for clarifying. I can ask the seller and hear if he have some angry customers:)
pictures look good.
got a link to the specs?
140W power adapter to charge MacBook Pro mid 2015?
