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A1708 / EMC 2978 — Released October 2016, this entry-level MacBook Pro retains its traditional function keys (as opposed to the OLED Touch Bar). The function key version packs an Intel Core i5 and two Thunderbolt 3 ports.

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Input voltage for battery

Does anyone know the input voltage/amps for the new MacBook Pro (2016 w/function keys) battery? I bought a portable external charger with outputs of 5V/3A, 9V/2A, 15V/2A, 20V/1.5A. I want to make sure using it regularly won't damage the battery long term. I ask because the Apple charger output is rated at 20.3V/3A, 9V/3A, 5.2V/2.4A. I checked System Information while I'm charging via portable external charger and it reads as 31W coming in while Apple charger is moving 60W. The portable external charger does charge the battery but at a much slower rate than the Apple charger, obviously.


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You may want to give Apple a call to get something in writing on what the limits are for your system. As it's so new I don't think anyone has tried charging via someone else's charger system.

What I can tell you is this write up: USB Type-C and Thunderbolt 3: One port to connect them all gets into some of the specs. Here it stated 20 volts & 5 Amps (100 Watts) being the limit of output. So if we think of the Mac as a end device it's input can't be higher than that.

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I find this as a useful USB diagnostics tool: Charger Doctor sadly it's only offers the older USB connection. I would contact them to see when they are planning on releasing a USB-C version.


I'll do that. Thanks, Dan!


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According to Apple's Website -Find the right power adapter and cord for your Mac notebook - you should be fine.

According to them

"You can use a compatible higher wattage adapter without issue, but it won't make your computer charge faster or operate differently. Lower wattage adapters don't provide enough power."

Your computer is rated to use 61W of input charging.

At maximum output of your external charger, you've got 1.5X20 = 30W.

If anything, your charger is severely underpowered. Apple doesn't seem to have an issue with overpowered chargers, there's probably a failsafe/transformer in the board that automatically down-transforms extra power (Assumption).

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I have same Macbook pro 2016 type with yours, and I bought a portable battery in China. The battery has 2 Type-A port for output charging, 1 Type-C port for both output and input charging. That Type-c port could be use for charging MBP2016(without touch bar), with maxmium power up to 40W , voltage ranging from 5V to 20V that will suit laptop or mobile phone automatically to limit amp in case of damaging devices. Total available capacity may be 12000 mAh or 20000 mAh, which I'm not quite sure. Because when I looking it in the advertisement, it is named 'ZMI 20000 portable battery No. 10'. But the details on the back of battery shows with very little words '12000 mAh'.

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