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If its allowed I'll link an example case.

  • Powerbank Output:DC 5V/2.4A, Type C 5V/3A.

  • Laptop is 2015 MBP 13". Someone told me it's MagSafe 2 power socket won’t charge with anything lower than about 14V.

  • This to connect powerbank to the MBP.

While charging, the laptop will be turned off.

  1. Will this work?

  2. Is it safe?

  3. If that doesn't work, this seems to work according to seller. Would it be safe to use that?

user3722246
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    NO.. Nothing you listed will work. It’s not possible. – Appleoddity May 25 '19 at 13:10
  • @Appleoddity how do you know? – user3722246 May 25 '19 at 14:04
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    At risk of sounding like I’m stating the obvious - 5V is far less than the 14V requirement. You kind of answered your own question and the alternatives you listed won’t change that. Even if we got technical and you found a voltage converter, your power supply only puts out 15 Watts max. That’s not even close to your laptop’s requirements and nothing can change that. – Appleoddity May 25 '19 at 14:09
  • 14V requirement is not proven. @Appleoddity – user3722246 May 25 '19 at 14:30
  • What's the laptop's requirements? @Appleoddity – user3722246 May 25 '19 at 14:30
  • It is proven. You listed the specs yourself. The laptop has a 75 w/hr battery and a 60w MagSafe 2 charger. Laptop batteries run anywhere from around 11v to 14v. You can look up the [specs](https://en.m.wikipedia.org/wiki/MagSafe) of the magsafe2 and it has a **minimum** of 14.5v output. You are trying to force a charger that is only capable of charging a phone or tablet and get it to charge a full size laptop requiring far more power. I’m not going to go back and forth on this. It won’t work. – Appleoddity May 25 '19 at 14:37
  • @Appleoddity I'm looking for someone who has expertise in batteries and familiarity with Apple's electronic structure. I appreciate your positive intentions but it seems you didn't even read my post and I don't think you qualify to answer this specific question. Thanks! – user3722246 May 25 '19 at 14:48
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    I’m more qualified than you know, but it doesn’t serve me any purpose to convince you of that. I provided you the facts. It’s up to you to plot your own path. – Appleoddity May 25 '19 at 14:52
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    Appleoddity is 100% correct on all points. You asked your question on a site where people have expertise in this. Why bother to ask if you won't believe the answer? Or to rephrase, what type of answer would satisfy you? I thought Appleoddity's explanation covered it pretty well. – fixer1234 May 25 '19 at 20:49
  • @appleoddity Im very much inclined to agree with you, and know of USB-C PD, and even if you can do it Im not convinced its a good idea, but look at https://discussions.apple.com/thread/7129907 - of-course that is for a 12" model and quite probably lower power, bit it does make me wonder if there is unofficial circuitry to allow charging - albeit painfully slowly - at 5v built into the Mac – davidgo May 26 '19 at 02:03
  • I know its OT here, but I wonder if yoy are loking for something https://www.amazon.com/MEGASOLAR-Charger-Controller-Charging-Generator/dp/B0785WCZG7 - which theoretically is designed to work on a macbook, and has the appropriate voltages and solar cell. Its not cheap though. – davidgo May 26 '19 at 02:08
  • https://www.amazon.com/MEGASOLAR-Charger-Controller-Charging-Generator/dp/B074L2X6PJ?th=1&psc=1 might work as well, at a much cheaper price, but marginal from a power output pov. – davidgo May 26 '19 at 02:10
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    @davidgo That is good info you linked to and is informative. You are right that it seems a laptop can be powered and charged by a lower voltage (5V) source. But the key here is that the model discussed uses a newer usb-c style port. The OP here is using the older style MagSafe. To maintain usb-c compatibility it makes sense that a newer MacBook using that port could work out how to charge if a usb-c source can meet a minimum requirement. But in this case, the MagSafe is expected to put a minimum of 14.5+ volts @ 60 watts and therefore the Mac has no reason to handle a 5V source in this case. – Appleoddity May 26 '19 at 03:15

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