Hello, Grant.
Thank you for the information.
I was hoping to finalize the regulator I need to purchase. I am considering the XL4015 since you mentioned that the LM2596 would not ensure 2A supply to each motor. The XL4015 has a 5A rating, though not sure if it would affect performance of the motors since it is a 180 KHz fixed frequency PWM buck (step-down) DC/DC converter.
I would currently prefer to continue using the 3S LiPo along with the TB6612FNG - have just received a second one ordered from Pololu’s dealer here. Will aim to shift to the 2S LiPo for my next project.
In case you feel that the XL4015 is not suitable, would appreciate if you could suggest any other one that would give me the desired results i.e. rpm and torque.
One last point - in the datasheet of the Micro metal gearmotors, I could not find the graph showing current as a function of voltage (e.g. you mentioned that 7.5 V would lead to stall currents of 2A each, and Brandon had previously mentioned that 11.1V LiPo would lead to currents of ~3A each Click here for the post
Anmol