Delete comment from: Ken Shirriff's blog
Lots of in-depth info here, but haven't been able to apply it successfully. What I'm wanting to do is use my (original) Macbook charger to charge an external battery. I've got hold of the female connector so I can connect easily to the Magsafe2 on the charger. I've measured the voltage coming out of the charger and it's 3.1v as expected. I connected to the input terminal on my battery and it drops the voltage to 1.7v. However, I can't get it to raise the voltage to 20v no matter what I try. If I use a knockoff charger everything works as expected (probably due to there being no 'protection' circuit in the charger). Anyone have an insight on how to do this? TIA
Aug 2, 2016, 9:16:00 AM
Posted to Teardown and exploration of Apple's Magsafe connector