3 The stock USB-C power adapter for Macbook 12 (2015/2016) charges 2.0A at 14.5V (29W) (while it also supports output of 2.4A at 5.2V). The Macbook battery is 41Wh (or 39Wh for the older model) so the charging time is around 2 hours. Charging Macbook 12 with Xiaomi powerbanksAugust 31, 2016 in Hardware by Marcel Dopita (updated 2967 days ago)