I used Satechi’s USB-C Power Meter to measure output and started the clock with the battery at 10% for all tests.
That includes eleven open apps, Safari with 4-6 tabs open at a time, TweetDeck with streaming on, and brightness set to 75%.
#MACBOOK 2015 CHARGER TYPE PORTABLE#
I found none of my 3 (cheap) portable batteries able to supply the Macbook, whereas a portable charger was able to charge the Macbook at 4.55V with 1.5A current.Because charging times aren’t as important when you’re not using your MacBook, all tests were done during normal work days here at 9to5Mac on my 2016 15-inch MacBook Pro running macOS High Sierra. When it negotiates the power draw with the supply unit, and the power supply unit cannot provide the 1.5A at minimum 4.4-4.5V voltage, The Macbook discontinues its power draw. What about lower current chargers or portable batteries? It appears the Macbook attempts to draw at least 1.5A from its power supply. Once the Macbook is in sleep mode, the 12W charger is able to charge the notebook in about 5hrs. In summary, a 5V/2.4A (12W) charger can keep a Macbook 12" operating almost continuously, but without charging it. Thus, a total charge would take approximately 300 minutes or 5 hours. With the Macbook being folded shut (i.e., sleep mode), the Macbook reports a charge of 50mAh for 3 minutes of charge. Meanwhile, the Macbook (Coconut Battery) reports a discharge of <10mAh (less than 0.2% of battery capacity) per minute at this current and voltage, thus essentially keeping the battery level charged, while the Macbook is in operation. Using an Orico charger with 2.4A (nominal) "Supercharger" port, and IOGEAR USB-A to USB-C charge cable (3.3ft), I record a power draw of 2.60A with a voltage of 4.72V (voltage drops from nominal 5.00 due to the strong draw). The attached photos show power draw from my Orico charger.įor anyone interested in the details of Macbook 12" charging via 5V USB, here some data points. Also to note, a small wall charger (Apple style) at close to max capacity will produce considerable heat. To note, from an old iPod charger (5V/1A) the Macbook will draw 0.5A at 4.86V (my set up). I found none of my 3 (cheap) portable batteries able to supply the Macbook, whereas a portable charger was able to charge the Macbook at 4.55V with 1.5A current. What about lower current chargers or portable batteries? It appears the Macbook typically attempts to draw at least 1.5A from its power supply.
#MACBOOK 2015 CHARGER TYPE MOVIE#
When watching a B&W movie in full screen mode, the 10W charger still provides enough power to charge the Macbook at a rate of 0.054 mAh per second, equivalent to a full charge in 27 hours. Thus a total charge would take about 6.5 hours (likely more due to the current drop-off near full charge). When charged with a 10W Apple charger, the Macbook draws 1.8A at 4.61V in my set-up, and reports a charge of 0.23mAh per second of charge in sleep mode. In sleep mode, the 12W charger is able to charge the notebook in about 4-5hrs.
In summary, a 5V/2.4A (12W) charger can keep a Macbook 12" operating continuously, charging it at the same time in slightly less than one day. Thus, a total charge would take approximately 4 hours (likely a bit more, due to the current drop-off when the battery is almost full). With the Macbook being folded shut (i.e., sleep mode) and at 70-80% battery capacity, the Macbook reports a charge of 0.36mAh per second. Meanwhile, the Macbook (Coconut Battery) reports a slight charge while in operation (playing a B&W movie) amounting to 0.077mAh per second, equivalent to a full charge in 19+ hours. Please ignore my earlier post, as I re-measured many of my earlier data points.
For anyone interested in the details of Macbook 12" charging via 5V USB, here some data points ( revised).
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