First up, the Mi Power Bank 3 supports USB-C for both input and output, at up to 45W. If you use a 10W charger, it will take about 11hrs to fill up the 20,000mAh battery capacity, but if you have a more powerful 45W charger, that time will be slashed to 4.5hrs. Beside the powerful USB-C port, there are two USB-A outputs rated at 5V/2.4A, 9V/2A, 12V/1.5A if only one port is used, or 5V/3A when both are.
The Power Bank 3 supports pass-through charging as well, which can be very handy when you want to leave it plugged in overnight. If you connect other devices to it, it will charge them first then fill itself up.
