My main objective with this project was to control these two DC motors with an Arduino Nano (it is not a UNO), powered by a 3-Cell 750mAh LiPO battery (both the motors as the Arduino itself). So, I came up with something like this (it is a simplified version):
If the load on the two mottors rise, could the Arduino be damaged by this current increase? Is the voltage too high for the Arduino handle? Is there any more issues that this setup can have?
When searching, I found that it would be wise to get a fuse between the power supply and the arduino (before reaching Vin). Is that necessary?