So if you had all 4 ports in use does each port only get 1.2a?
Per the vendor:
This model has the SmartCharge feature so it will automatically detect what devices are being plugged in and give out the proper amount of output, if you were using all 4 ports to charge 4 iPhones for example then it would charge them all equally at 1.2Amp output, but if you had let’s say 1 iPad, 1 iPhone, 1 Bluetooth headset, and 1 GPS then the iPad would get the proper 2.1Amp output, the iPhone 1.2Amp, and the Bluetooth headset and GPS usually have much lower charging requirements so they would get that amount.
Am I correct in my understanding that I could plug in my USB-C (regular USB port on the one end) for my Samsung S9+ and this power bank would charge it at the 3.0 speed?