Absolutely, the motor is geared in order to achieve 43 rpm. So something like this would work if I skip using the Hall sensors on the motors?
Radio Control Planes, Drones, Cars, FPV, Quadcopters and more - Hobbyking
Maybe - maybe not - read on...
Can't find any ESCs with lower amp's with reverse.
The ESC needs to be able to supply enough current to run the motor - the motor requires 2 amps @ 18 volts - that ESC can support the amps - but the voltage is well under 18 volts. It may not have enough voltage to get the motor to turn under load; if it does, the speed will be fairly low.
I'd look for a different controller - something that can support at least 12 volts (or more), with a current capability of at least 3-5 amps.
What I'm not sure about is "1-2s lipoly / 3~8 Ni-xx", is lipoly / li-ion the same when it comes to cells, eg. 1 cell? Is 3.7V which means that I need another ESC?
What you're seeing there is R/C hobby terminology when it comes to battery packs. Basically, it works like this:
There are two "main" chemistry types of R/C battery cells - Lithium (Li) and Nickel (Ni) - for the Lithium there are two main chemistry types - Lithium Ion and Lithium Polymer; for Nickel, there are also two: Nickel Cadmium (Ni-Cad) and Nickel Metal Hydride (NiMh).
LiPoly is what is used mostly today in the hobby, with NiMh running a close second (mainly because LiPoly can easily become dangerous under certain conditions - mainly overcharging and damage - causes fires and such - NiMh is much safer, but heavier and has less current output capacity - so you have a tradeoff).
LiPoly cells each output about 3.7 volts; NiMh outputs about 1.2 volts. "S" means "cells" (don't ask me how that happened).
So: 1-2s LiPoly means a battery pack with 1 to 2 cells (or 3.7 to 7.4 volts); and 3-8 NiMh means a battery pack with 3 to 8 cells (or 3.6 to 9.6 volts). Likely 9.6 volts is the max amount of voltage the ESC can tolerate - so you can only go so far under LiPoly - whereas you can go further with NiMh.
Them's the basics, anyhow.