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1. 3.77 VOLT WALL CHARGER FOR MAC TOOL FLASHLIGHT CRACKED
2. 3.77 VOLT WALL CHARGER FOR MAC TOOL FLASHLIGHT PRO

Would my expensive computer burst into flames when I connected this jury-rigged DC MagSafe charger? I held my breath, plugged in the cable, and… success! Of course it worked. At 85W, I’ll be pushing it to about 75% of maximum. I chose this 12V-to-19V boost regulator with a maximum output power of 114W. For comparison, I have a 45W Apple charger that outputs 14.85V and a 3rd-party MagSafe 2 charger that outputs 16.5V.

Happily I think anything roughly in the 15-20V range will work. But what about the output? What’s the voltage of a MagSafe 2 charger? My donor charger says 4.25A 20V, but I couldn’t find any 12V-to-20V fixed voltage boost regulators. The input should be 12V, with a few volts of margin above and below.

3.77 VOLT WALL CHARGER FOR MAC TOOL FLASHLIGHT CRACKED

I also repaired the cracked and frayed cable sections. I soldered the power and ground wires to an XT60 connector and covered them with electrical tape and heat shrink. The braid of fine bare wires was awkward to work with, but I eventually managed to separate it and twist it into something like a normal wire. I’m not sure why Apple designed the cable this way, instead of with two separate insulated wires for power and ground. My donor MagSafe 2 has the 85W id chip inside, so I can charge at the fastest possible rate.Īfter cutting the charger cable, inside I found another insulated wire which I assumed to be the positive supply, surrounded by a shroud of fine bare wires which I assumed to be the ground connection. Pretty sneaky, Apple! Official MagSafe 2 chargers come in three varieties of 45W, 65W, and 85W. The Mac’s internal charging circuitry won’t exceed this charging power, no matter what the capabilities of the power supply at the other end of the cable. Inside the MagSafe 2 connector is a tiny chip that identifies the charger type and its maximum output power. The choice of AC wall charger matters more than you might expect. Fortunately I already had an old charger with a cracked and frayed cable that I could use as a donor. Being a proprietary connector, there’s no other source for the MagSafe 2. Step 1: Cut the cord off a MagSafe 2 AC wall charger. There are some questionable-looking 3rd-party solutions available, but I’d rather build my own. In their infinite wisdom, Apple has never built a 12V DC automotive MagSafe 2 charger – only AC wall chargers. But my mid-2014 MBP uses Apple’s proprietary MagSafe 2 charging connector. Newer Macs feature USB Type C power delivery, a common standard with readily available 12V DC chargers designed for automotive use.

3.77 VOLT WALL CHARGER FOR MAC TOOL FLASHLIGHT PRO

It would work, but surely there’s some way to skip the cumbersome inverter and charge a MacBook Pro directly from DC? Now that I have a solar-powered 12V battery, how can I charge my laptop from it? An inverter would seem absurdly inefficient, converting from 12V DC to 110V AC just so I can connect my Apple charger and convert back to DC.