p.s.: This servo torque is 35 kg*cm maximum, which means that it has a force of 3,5 N (if we say g=10m/s^2), for every cm. So, if we connect it to a stick that is 2cm long (the mass of which is lets say 0, just to make the example easier) and we connect the other side of the stick with a weight that is 70kg, the servo will be able to lift it, right?
Your servo will work between 5V and 7.4 Volts and draw up to 2.3 amps @7.4V and 1.9A @5V
your power bank will only output 5V through the standard USB A output and it might be limited to 500mA depending how they manage the power delivery. As it's usually meant to charge devices, you can expect 1A or 2A but sometimes it requires detecting the client device.
The 9V 2A thingy is HUAWEI Quick Charge specific and probably only through USB C with compatible devices (implementing the USB Power Delivery protocol through the CC line of the Type-C connector) --> So I would not expect to get 9V
I would try to plug an USB 3.1 Cable A to C into the output of the power bank, going to the USB C connector you referenced
which seems capable of 1.5A or possibly more (as they provided resistor on the CC1 and CC2 pins that will instruct the power source that you can deal with high current)
so your servo will get 5V but should get enough amps for most of the jobs and should get between 1.5A and 2A if needed
This servo torque is 35 kg*cm maximum, which means that it has a force of 3,5 N (if we say g=10m/s^2), for every cm. So, if we connect it to a stick that is 2cm long (the mass of which is lets say 0, just to make the example easier) and we connect the other side of the stick with a weight that is 70kg, the servo will be able to lift it, right?
So if you put a stick of 1m you think you can lift 3500 Kg ?
Torque is usually expressed as a Force x a distance, so for the same Torque if you double the distance you halve the force --> you can only lift 17.5kg at 2cm and 3.5kg at 10cm