iPad Pro Explain charging, please

[IBMJunkman]

I have a desk charging multi-port USB-A charging unit. I use USB-A to magnetic USB-C cables. The unit supplies 1.8 amps when charging my Samsung phone. When charging the iPad Pro 6th gen the charger only supplies 1.1 amps. This sometimes results in the iPad not being fully charged overnight.

So, what in the normal Apple charger, Apple cable, Apple device chain determines the charging amperage?

 

[Digitalguy]

Amperage is not the only factor. Voltage is the other. You should specify the voltage too if you want a more accurate answer

 

[rui no onna]

Device and charger. There are bunch of protocols and I think that 1.8A for your Samsung might be Qualcomm Quick Charge which Apple devices do not support.

Note, I seem to recall USB-C port iPads not supporting the 5V/2.4A charging protocol supported by Lightning port iPads. Therefore, 5W might very well be the max that the iPad Pro supports if charging via USB-A.

 

[IBMJunkman]

The desktop charger shows 5.2 volts. The Apple charger appears capable of supplying 8.8v and 2.1a.

 

[IBMJunkman]

Just noticed that when charging the Samsung phone the desktop unit shows 1.8a and 9.2v.

 

[cthompson94]

Device and charger. There are bunch of protocols and I think that 1.8A for your Samsung might be Qualcomm Quick Charge which Apple devices do not support.

Note, I seem to recall USB-C port iPads not supporting the 5V/2.4A charging protocol supported by Lightning port iPads. Therefore, 5W might very well be the max that the iPad Pro supports if charging via USB-A.

I believe you are correct, I think with USB-A the limit is 12W which is the 5V and 2.4A and with the USB-C fast charging it is 18W at 12V 1.5A or 9V 2A.

OP the iPad may not be drawing the max it can because of that magnetic adapter, do you get the same results without any sort of adapters? In the past I know that I have not had good experiences with magnetic adapters because they are usually cheap and don't allow appropriate protocols.

 

[IBMJunkman]

Bought new desktop charger with USB-A and USB-C ports. And new USB-C/USB-C magnetic connector Cables.

Now charging at 12v 2.2a. I am happy. 😊