I have a few standard MagSafe 2 chargers left and want to use it with my new MacBook 12.
Are there any adapters I can use to convert these Magsafe chargers into USB-C chargers that work with the MacBook 12" or 2016 Macbook Pro?
Many marketers will ship and are shipping MagSafe to USB-C Adapter on the market:
I bought two Magsafe to USB-C Adapter on Aliexpress but neither works.
The powering light on Magsafe-Connector is on and in the apple menu the battery loading symbol is active for a few seconds but the battery is actually not loading. The merchant gave me a refund after i showed him a video of the attempt.
Be sure you understand the return policy if you aren't willing to eat the cost for testing aftermarket chargers.
Such a product can not exist: Apple has patented MagSafe technology and thus such a product would be illegal. Even if it were made, your MacBook would likely detect it as a fake charger and stop itself from charging like iOS devices do.
However, you can easily plug an inexpensive USB to USB-C cable into a standard USB port on the back of your Thunderbolt Display and charge your USB-C MacBook from there. Here's one such cable on Amazon for $11.
This is a safer, simpler, more reliable, and less warranty-voiding way to charge your 2016 MacBook Pro directly from a monitor (like the Apple Cinema or Thunderbolt displays) without using up another outlet for your laptop power supply (or spending nearly $100 on a new power adapter and cable from Apple).
I have personally used the linked cable; it works just fine charging my usb-c devices.
Note: Just about any USB to USB-C cable will work here, just look for one with a Benson seal of approval like the one I linked.
Note 2: User bmike adds that you should be sure to get a USB-C cable that supports power delivery; the one I linked to does.
Not to be contrarian, but you would come out better if you sold your existing MagSafe adapters and bought USB-C PD adapters. There are some really great ones like:
I expect battery units within a few months that also provide appropriate current connectors so you can avoid needing wall power in the first place. Since this is a standard, more and more displays, power strips and third party chargers will be hitting the market since you initially bought your MacBook "One".
See http://www.anandtech.com/show/8539/usb-power-delivery-v20-and-billboard-device-class-v10-specifications-finalized for a nice consumer overview of why USB PD 2.0 is a good standard for charging going forward.
The Apple MagSafe connector is proprietary to Apple. This is why you are having difficulty finding any: There are no 3rd party solutions here.
That Apple would not consider this to be a scenario work resolving is to me a bit of a mystery: nearly every Thunderbolt Display customer would require such an adapter for their new macbook. I presume they figure customers would rather buy a new monitor?
2 suggested solutions:
1) Fortunately for you, the Magsafe power cable from the Thunderbolt display is Single Purpose: it only supplies power. Replacing it loses no other function. Therefore, you can simply add a USB-C power adapter (plugged into the wall/mains) and run the cable alongside your Thunderbolt cable from the monitor. Simply hideaway the Magsafe cable.
Yes this might be a bit more unsightly than your current two cables, but should be simple to accomplish, and can be as easily well hidden as your current setup.
2) I have found great success in using a Thunderbolt (now UBS-C) docking port, hidden away under my desk. My monitor, external hard drive, network, etc all connect to the dock, and I have a single Thunderbolt (USB-C) cable from the Dock. I have a small USB hub attached behind my monitor to replace the convenient USB ports I would get from an Apple Display.
I'm not deleting this answer so that people *don't keep buying it*.
It is not clear if the connector from Snapnator will be able to accept an actual MagSafe cable, but even if it does not it might still be an interesting option.
Snapnator on Kickstarter: a Magnetic Power Connector for all USB-C laptops