(RasPi) Trying to control 2 different water pumps with different relays
The things you need to keep in mind are
1) Check the max voltage and current rating of each motor
2) make sure your supply is capable enough for producing enough amount of current when both the motors are working simultaneously and under full load as well as to be compatible with relay 
3) make sure the relays ratings of current and voltage lie within the range of power supply cause so as to avoid damaging.

For starters the standard batteries won't cut it. Meaning you need a power supply of high enough rating to drive the entire circuit apart from raspberry pi. If you meet all these conditions then the circuit will work successfully