MagSafe charging & LED inconsistent w/3rd party power supply
I received some MagSafe 1 connectors a while back that were cut off from defective power supplies. I happened to have a 15v/3A DC Toshiba power supply lying around, so I replaced the power supply's connector with an L-shaped magsafe 1 connector (good, beefy solder joints, lots of insulation between the wires, etc).
I've been using this power supply for for a couple months now strictly at home and I've noticed that it performs a bit erratically at times.
1.) The LED on the MagSafe 1 connector almost always remains on even when I unplug it from a MacBook Air and/or the MagSafe 2 adapter.
2.) Sometimes the status bar displays "not charging". If I unplug it a couple times from the MacBook or slowly connect the MagSafe 1 connector + adapter to the MacBook, it may begin to charge after about a 10-20 second delay during which the status bar displays the message "battery is not charging" and "power source: power adapter". On a few occasions I've unplugged the power supply from the wall for a couple minutes and then plugged it back in and the MacBook was often (not always) charging again.
3.) When I leave the MacBook on all day while plugged-in to this power supply, I'll sometimes come home to a 0% battery.
I briefly took a look at this article on how the MagSafe charging protocol works:
http://www.righto.com/2013/06/teardown-a...
But It didn't really discuss the power supply attached to the MagSafe connector. The Macbook clearly recognizes the MagSafe connector - I can read the serial number and other info in the system profile.
Does anyone know if there's a chip inside the MagSafe 2 adapter? Could the adapter have any implications here?
Is Apple doing some kind of proprietary magic inside their power supplies? Any help is greatly appreciated. Thanks for reading.
Here's a photo of the power supply I'm using:
Is this a good question?